Year	% of cohort
1970	48.7806015014648
1971	48.7988090515137
1972	49.2585105895996
1973	48.1601486206055
1974	47.844539642334
1975	50.7358207702637
1976	58.0625305175781
1977	57.0735397338867
1978	56.7218818664551
1979	56.4919891357422
1980	55.3480796813965
1981	58.7032814025879
1982	62.2584686279297
1983	63.2149696350098
1984	59.5183486938477
1985	61.1249198913574
1986	63.3856811523438
1987	63.8830299377441
1988	65.6951599121094
1989	66.6125335693359
1990	69.5311737060547
1991	71.9198837280273
1992	70.3191604614258
1993	72.6092987060547
1994	74.3923873901367
1995	76.7935333251953
1996	77.3964080810547
1997	78.5297470092773
1998	79.977653503418
1999	80.3044509887695
2000	79.9081420898438
2001	82.6660385131836
2002	82.0029220581055
2003	82.7517700195312
2004	83.1320724487305
2005	83.8293380737305
2006	85.140510559082
2007	84.3835296630859
2008	86.2686614990234
2009	86.2611694335938
2010	86.4380798339844
2011	86.001106262207
2012	85.4543533325195
2013	87.1953277587891
2014	87.8910293579102
2015	87.5026092529297
2016	88.1897506713867
2017	88.2680206298828
2018	88.7797317504883
2019	88.5642166137695
2020	89.1644515991211
2021	89.4555892944336