Year	% of cohort
1960	62.660361
1961	62.66429
1962	62.959639
1963	63.541085
1964	62.997265
1965	63.277053
1966	64.027023
1967	63.040223
1968	63.038737
1969	62.705915
1970	63.265761
1971	63.857914
1972	64.419669
1973	65.334054
1974	65.85226
1975	66.043937
1976	66.45303
1977	66.575293
1978	66.130142
1979	65.686977
1980	65.742113
1981	65.351889
1982	65.046013
1983	64.299086
1984	64.293122
1985	64.842115
1986	65.029341
1987	65.208041
1988	65.915495
1989	66.242717
1990	66.883629
1991	67.467785
1992	67.656041
1993	68.04395
1994	68.531424
1995	69.357388
1996	68.886541
1997	69.044689
1998	68.109967
1999	65.226065
2000	68.376032
2001	70.201587
2002	70.032202
2003	70.230932
2004	70.311901
2005	70.466012
2006	71.645961
2007	72.103333
2008	72.676204
2009	72.736137
2010	73.441037
2011	74.064022
2012	74.676847
2013	75.48156
2014	75.849311
2015	76.195358
2016	77.172842
2017	77.408572
2018	78.186922
2019	78.539713
2020	76.1482
2021	74.797238
2022	74.919975