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The following tables display how many members have joined or quit Mensa in each month.

Entries by month

Year of Entry	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year Total
2010	3	4	6	11	8	18	7	4	9	16	15	11	112
2011	12	3		4	1	2	10	16	10	10	17	7	92
2012	12	11	11	10	16	8	13	10	17	13	12	6	139
2013	11	7	10	10	7	9	14	8	12	14	10	20	132
2014	10	12	12	15	11	6	11	12	8	24	16	10	147
2015	20	17	15	17	15	14	14	9	35	17	22	19	214
2016	15	13	23	14	26	9	13	15	20	20	7	18	193
2017	30	17	10	20	32	14	16	9	29	19	24	5	225
2018	19	23	8	19	17	21	41	8	17	21	17	18	229
2019	16	26	21	21	21	21	23	14	12	18	29	26	248
2020	16	13	35	6	8	23	13	11	25	28			178

Exits by month

Year of Exit	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year Total
2010						14	6	5	5	1	2	3	36
2011	40	3				3	2	25	6	4	2		85
2012	1	1	3		52	5	27				24	1	114
2013	1	1				31		1	2				36
2014	17					33			1				51
2015	21				1	19	2	3	3	3	3	25	80
2016						26	5	2	1	2	1	1	38
2017		33				24	6	1	2		1	2	69
2018	3	3	45	4	8	67	8	1	2	2	1	2	146
2019	58		1	3	1	82	3	1		1		52	202
2020			2			72			4	1			79

Resulting Balance

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year Total
2010	3	4	6	11	8	4	1	-1	4	15	13	8	76
2011	-28			4	1	-1	8	-9	4	6	15	7	7
2012	11	10	8	10	-36	3	-14	10	17	13	-12	5	25
2013	10	6	10	10	7	-22	14	7	10	14	10	20	96
2014	-7	12	12	15	11	-27	11	12	7	24	16	10	96
2015	-1	17	15	17	14	-5	12	6	32	14	19	-6	134
2016	15	13	23	14	26	-17	8	13	19	18	6	17	155
2017	30	-16	10	20	32	-10	10	8	27	19	23	3	156
2018	16	20	-37	15	9	-46	33	7	15	19	16	16	83
2019	-42	26	20	18	20	-61	20	13	12	17	29	-26	46
2020	16	13	33	6	8	-49	13	11	21	27			99

Number of Members at end of month

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
2010	795	799	805	816	824	828	829	828	832	847	860	868
2011	840	840	840	844	845	844	852	843	847	853	868	875
2012	886	896	904	914	878	881	867	877	894	907	895	900
2013	910	916	926	936	943	921	935	942	952	966	976	996
2014	989	1001	1013	1028	1039	1012	1023	1035	1042	1066	1082	1092
2015	1091	1108	1123	1140	1154	1149	1161	1167	1199	1213	1232	1226
2016	1241	1254	1277	1291	1317	1300	1308	1321	1340	1358	1364	1381
2017	1411	1395	1405	1425	1457	1447	1457	1465	1492	1511	1534	1537
2018	1553	1573	1536	1551	1560	1514	1547	1554	1569	1588	1604	1620
2019	1578	1604	1624	1642	1662	1601	1621	1634	1646	1663	1692	1666
2020	1682	1695	1728	1734	1742	1693	1706	1717	1738	1765

The following table shows the event activity by month by counting the signups for all Mensa events in each month.

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year Total
2010								18	39	96	45	55	253
2011	80	74	26	16	78	65	42	64	82	145	100	107	879
2012	55	57	62	61	94	88	69	179	75	76	95	83	994
2013	123	54	65	73	46	38	66	114	69	62	77	31	818
2014	110	54	50	39	59	24	89	151	72	61	59	62	830
2015	79	46	72	39	55	63	58	83	155	79	58	83	870
2016	108	107	76	104	73	76	86	179	143	66	101	94	1213
2017	94	142	128	86	117	129	135	75	66	74	65	86	1197
2018	117	54	97	120	116	93	105	116	127	118	99	60	1222
2019	115	107	153	138	103	98	83	110	101	155	134	102	1399
2020	330	178	56	5	28	60	96	119	80	36			988

The following table displays the number of forum posts by month. As you can guess from the numbers, the website was launched in August 2010. Forum activity reached an all-time high in January 2011 with 2'217 posts. The most active single day was March 23rd 2011 with 167 posts. In general, forum activity has been declining in the last years, reaching an all-time low in March 2020 with 3 posts.

Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year Total
2010	2	4	1	7		2		255	613	450	344	613	2291
2011	2217	1176	1095	555	645	534	222	250	479	1268	955	805	10201
2012	605	385	651	839	825	443	404	579	783	924	777	309	7524
2013	370	541	653	425	572	368	174	305	177	399	217	173	4374
2014	340	342	250	338	390	241	278	250	335	250	358	231	3603
2015	370	169	298	211	165	174	167	163	244	107	390	48	2506
2016	161	170	149	108	64	67	71	54	50	20	148	77	1139
2017	101	59	64	46	43	12	88	32	118	58	65	31	717
2018	45	26	57	20	16	12	16	33	13	33	57	68	396
2019	14	10	48	45	14	46	26	14	12	18	24	6	277
2020	39	12	3	8	5	7	3	6	6	15			104

Today is day number 304 of 2020. The predicted total at year-end is 125 posts.

The following table displays the distribution of our members by decade of entry into Mensa Switzerland.

Decade of Entry	Number of Members who joined in that decade	Cumulative
1960s	3	3
1970s	5	8
1980s	8	16
1990s	56	72
2000s	363	435
2010s	1169	1604
2020s	176	1780

As the table shows, although Mensa Switzerland was founded as early as 1965, the majority of our members joined just recently in the 2010s, and more than 90% joined after the turn of the millennium.

The following table displays the distribution of our members by year of entry into Mensa. Please note that the actual number of members that Mensa Switzerland had in these years is higher, because in this table only members who are still members today are counted. Nevertheless, the numbers can give you some indication of the speed at which Mensa Switzerland was growing at various times. In percentage terms, Mensa Switzerland underwent a particularly rapid expansion in the five years from 1998 to 2002.

Year of Entry	Number of Members who joined in that year	Growth in %	Cumulative
1965	2		2
1966	1	50%	3
1970	1	33%	4
1972	1	25%	5
1975	2	40%	7
1977	1	14%	8
1981	4	50%	12
1982	1	8%	13
1983	2	15%	15
1986	1	7%	16
1990	3	19%	19
1991	4	21%	23
1992	1	4%	24
1993	7	29%	31
1994	1	3%	32
1995	1	3%	33
1996	3	9%	36
1997	6	17%	42
1998	15	36%	57
1999	15	26%	72
2000	19	26%	91
2001	51	56%	142
2002	60	42%	202
2003	27	13%	229
2004	22	10%	251
2005	23	9%	274
2006	37	14%	311
2007	35	11%	346
2008	45	13%	391
2009	42	11%	433
2010	51	12%	484
2011	49	10%	533
2012	78	15%	611
2013	82	13%	693
2014	94	14%	787
2015	132	17%	919
2016	116	13%	1035
2017	147	14%	1182
2018	180	15%	1362
2019	226	17%	1588
2020	176	11%	1764

Average year of entry = 2012.94

The following table displays the age distribution of our members by birthyear.

Birthyear	Age	Number of Members
1928	92	2
1929	91
1930	90
1931	89
1932	88
1933	87
1934	86	1
1935	85
1936	84
1937	83	1
1938	82	1
1939	81	1
1940	80	2
1941	79	1
1942	78	2
1943	77
1944	76
1945	75	3
1946	74
1947	73	2
1948	72	2
1949	71	2
1950	70	3
1951	69	4
1952	68	3
1953	67	4
1954	66	10
1955	65	13
1956	64	12
1957	63	18
1958	62	11
1959	61	16
1960	60	15
1961	59	24
1962	58	29
1963	57	19
1964	56	24
1965	55	32
1966	54	28
1967	53	37
1968	52	43
1969	51	38
1970	50	43
1971	49	45
1972	48	47
1973	47	56
1974	46	61
1975	45	46
1976	44	59
1977	43	63
1978	42	49
1979	41	61
1980	40	66
1981	39	63
1982	38	59
1983	37	57
1984	36	52
1985	35	55
1986	34	47
1987	33	51
1988	32	55
1989	31	46
1990	30	46
1991	29	42
1992	28	32
1993	27	37
1994	26	57
1995	25	23
1996	24	36
1997	23	35
1998	22	19
1999	21	18
2000	20	11
2001	19	16
2002	18	9
2003	17	11
2004	16	11
2005	15	6
2006	14	8
2007	13	8
2008	12	4
2009	11	7
2010	10	6
2011	9	8
2012	8	3
2013	7	2
2014	6	1

Average Birthyear = 1980.4
Current Year = 2020.83
Average Age = 40.43