Year	% of cohort
1971	63.5584106445312
1972	63.2209892272949
1973	62.5699195861816
1974	62.4169998168945
1975	63.7454795837402
1976	64.6244583129883
1977	65.9749603271484
1978	65.7462310791016
1979	65.9675216674805
1980	65.6057434082031
1981	66.1232223510742
1982	66.2234573364258
1983	66.6621627807617
1984	66.3984222412109
1985	67.2128295898438
1986	68.4730529785156
1987	70.6727981567383
1988	71.1796875
1989	71.2258529663086
1990	72.56787109375
1991	72.9302291870117
1992	73.3078231811523
1993	74.031608581543
1994	74.4453887939453
1995	75.1907730102539
1996	75.5638809204102
1997	75.6290588378906
1998	75.2928085327148
1999	75.4103012084961
2000	74.6198120117188
2001	75.708122253418
2002	75.7008819580078
2003	75.7146377563477
2004	75.991340637207
2005	76.3563613891602
2006	76.1727523803711
2007	76.7516174316406
2008	79.1809921264648
2009	79.5534591674805
2010	79.4570617675781
2011	80.3125610351562
2012	80.5287704467773
2013	82.1110534667969
2014	85.4469985961914
2015	85.0320663452148
2016	85.2394485473633
2017	85.0178298950195
2018	84.441650390625
2019	87.1794662475586
2020	87.2797012329102
2021	87.8798980712891