Year	% of cohort
1960	40.880693
1961	41.523282
1962	41.747685
1963	42.313728
1964	42.567651
1965	43.140774
1966	43.220907
1967	43.680765
1968	43.982016
1969	44.593877
1970	45.239055
1971	45.658712
1972	46.537065
1973	47.193735
1974	47.123552
1975	47.645504
1976	47.651457
1977	48.223668
1978	48.342838
1979	48.823686
1980	49.422553
1981	49.91135
1982	50.203553
1983	51.264576
1984	51.523928
1985	51.82675
1986	51.80921
1987	52.031245
1988	52.172491
1989	52.051214
1990	50.888703
1991	49.745197
1992	46.991674
1993	46.940277
1994	47.78408
1995	49.73183
1996	50.944384
1997	51.39195
1998	52.698986
1999	53.916254
2000	55.302202
2001	56.432456
2002	58.152059
2003	59.127715
2004	60.520778
2005	60.923525
2006	62.149051
2007	62.989098
2008	63.945038
2009	64.63934
2010	65.248073
2011	66.10192
2012	66.736984
2013	68.012257
2014	68.777928
2015	69.249612
2016	69.870729
2017	70.925436
2018	72.377426
2019	73.381106
2020	54.801393
2021	59.929412
2022	73.805811