Year	% of cohort
1960	30.838348
1961	31.011355
1962	31.210935
1963	31.681522
1964	31.811769
1965	32.196442
1966	32.361751
1967	32.815421
1968	33.567785
1969	33.702232
1970	34.089612
1971	34.449996
1972	35.014041
1973	35.092603
1974	35.35862
1975	36.074497
1976	36.579275
1977	37.206104
1978	37.910073
1979	38.589702
1980	39.251674
1981	39.774257
1982	40.389267
1983	40.99691
1984	41.536165
1985	42.344139
1986	42.55342
1987	43.089401
1988	42.854676
1989	42.814952
1990	42.552837
1991	43.462007
1992	44.885072
1993	45.630868
1994	45.611937
1995	46.359713
1996	47.06526
1997	48.282086
1998	48.748545
1999	48.858398
2000	48.601397
2001	48.752369
2002	49.375186
2003	49.868882
2004	50.622753
2005	51.548723
2006	52.365601
2007	53.291578
2008	54.214316
2009	54.557901
2010	55.39795
2011	55.763995
2012	56.82317
2013	57.220648
2014	57.621113
2015	57.625326
2016	58.185859
2017	59.069129
2018	59.109418
2019	59.967632
2020	58.844528
2021	57.681176
2022	57.901046