Year	% of cohort
1960	61.619237
1961	61.651173
1962	61.769605
1963	61.893939
1964	64.158436
1965	63.257843
1966	63.112633
1967	63.37708
1968	62.576999
1969	61.263626
1970	61.543264
1971	62.110735
1972	61.648239
1973	62.161843
1974	62.293231
1975	60.327064
1976	59.101742
1977	59.834254
1978	58.494064
1979	58.063691
1980	57.645862
1981	57.426303
1982	58.694401
1983	58.253866
1984	57.599973
1985	57.115872
1986	60.002511
1987	60.015726
1988	59.981413
1989	59.486571
1990	57.237453
1991	56.707073
1992	55.22004
1993	52.869565
1994	50.548299
1995	52.450975
1996	56.437619
1997	57.693593
1998	56.424156
1999	58.301976
2000	59.016859
2001	58.598832
2002	59.64971
2003	60.550368
2004	61.488311
2005	62.794869
2006	63.097099
2007	63.36667
2008	65.552792
2009	67.542178
2010	68.95494
2011	70.449992
2012	70.711508
2013	72.583624
2014	72.527068
2015	74.003419
2016	74.417069
2017	75.216329
2018	75.780109
2019	76.97069
2020	76.453576
2021	75.720874
2022	77.702688