Year	% of cohort
1960	49.182092
1961	50.331965
1962	51.478495
1963	52.597646
1964	46.833595
1965	54.889181
1966	55.663449
1967	56.94088
1968	58.074756
1969	59.343075
1970	60.513205
1971	61.6245
1972	62.804567
1973	64.018911
1974	65.151925
1975	66.2561
1976	67.269342
1977	68.217601
1978	69.102794
1979	69.913324
1980	70.61956
1981	71.302624
1982	71.847011
1983	72.424109
1984	72.862684
1985	73.387328
1986	73.829939
1987	74.309568
1988	74.736209
1989	75.124465
1990	75.218384
1991	75.476967
1992	76.377776
1993	76.868745
1994	77.31956
1995	77.7634
1996	78.205714
1997	78.638965
1998	79.064733
1999	79.484857
2000	79.915417
2001	80.334407
2002	80.746213
2003	81.079057
2004	81.427232
2005	81.447305
2006	81.965969
2007	82.081428
2008	82.154931
2009	77.57836
2010	82.171085
2011	82.056356
2012	81.779619
2013	82.194972
2014	82.245781
2015	82.300577
2016	82.326071
2017	82.385069
2018	82.421448
2019	81.495747
2020	82.552332
2021	82.615929
2022	82.44981