Year	% of cohort
1960	37.4046
1961	38.132789
1962	38.846112
1963	39.568816
1964	39.895238
1965	40.607562
1966	41.281147
1967	41.978502
1968	42.74177
1969	43.461227
1970	44.294689
1971	45.108506
1972	45.892997
1973	46.825145
1974	47.62216
1975	48.45535
1976	49.2493
1977	50.085807
1978	50.933163
1979	51.417961
1980	52.505516
1981	53.301336
1982	53.920807
1983	54.696073
1984	55.381682
1985	56.127834
1986	57.30336
1987	56.86998
1988	59.054795
1989	59.076263
1990	59.685709
1991	61.562546
1992	61.705494
1993	62.174098
1994	62.505379
1995	62.878565
1996	65.24382
1997	65.381552
1998	65.462372
1999	64.925248
2000	65.909811
2001	66.149732
2002	66.59379
2003	66.721595
2004	66.860437
2005	67.077111
2006	67.323484
2007	67.558916
2008	67.742627
2009	67.924024
2010	67.893614
2011	67.695018
2012	67.609801
2013	67.632991
2014	67.675767
2015	67.702782
2016	67.781462
2017	67.650439
2018	67.823748
2019	67.831073
2020	69.802151
2021	69.503614
2022	68.738929