Year	% of cohort
1970	43.8159790039062
1971	42.8232192993164
1972	43.7153282165527
1973	44.6484413146973
1974	46.3564300537109
1975	46.9620704650879
1976	47.0009117126465
1977	48.7076110839844
1978	48.0061988830566
1979	48.2153701782227
1980	47.6900901794434
1981	47.6510887145996
1982	49.2467803955078
1983	49.7984313964844
1984	50.639949798584
1985	52.615608215332
1986	53.8160095214844
1987	54.194938659668
1988	54.5517196655273
1989	54.6764106750488
1990	55.8148307800293
1991	55.5334892272949
1992	56.864818572998
1993	56.7102394104004
1994	55.9203491210938
1995	56.8623886108398
1996	56.149600982666
1997	56.1295013427734
1998	56.1831016540527
1999	57.7786598205566
2000	59.861198425293
2001	62.6256904602051
2002	61.8818511962891
2003	60.565128326416
2004	61.4351692199707
2005	61.2170104980469
2006	61.9346504211426
2007	61.1669998168945
2008	59.5887184143066
2009	58.0680809020996
2010	57.5900611877441
2011	58.8787384033203
2012	56.0304412841797
2013	55.6686096191406
2014	56.4494590759277
2015	57.8772392272949
2016	58.053409576416
2017	59.8751602172852
2018	60.0390090942383
2019	60.7453193664551
2020	62.0004997253418