Year	% of cohort
1960	25.730892
1961	26.096887
1962	26.276862
1963	26.694082
1964	26.816436
1965	27.391908
1966	27.610517
1967	24.395453
1968	25.993135
1969	26.498531
1970	29.137529
1971	30.35293
1972	31.402557
1973	32.510438
1974	33.471841
1975	34.55203
1976	35.911429
1977	36.822053
1978	37.120352
1979	37.229996
1980	37.049488
1981	37.356377
1982	37.103893
1983	37.314433
1984	37.141769
1985	36.514079
1986	36.02223
1987	35.900913
1988	35.905259
1989	36.032291
1990	35.61725
1991	34.795871
1992	34.608847
1993	34.698146
1994	34.258315
1995	33.982277
1996	33.890967
1997	34.296192
1998	35.004523
1999	35.77119
2000	36.679928
2001	37.257505
2002	37.465725
2003	38.114959
2004	38.572551
2005	39.340757
2006	40.065255
2007	40.461689
2008	41.012643
2009	41.764599
2010	42.158643
2011	42.84596
2012	43.052895
2013	43.330546
2014	43.398461
2015	43.479525
2016	44.070977
2017	44.25892
2018	44.700988
2019	45.121036
2020	44.052693
2021	43.309647
2022	46.041738