Year	% of cohort
1960	53.971659
1961	54.640184
1962	55.149523
1963	55.662566
1964	56.1842
1965	56.612216
1966	56.961017
1967	57.325538
1968	57.632495
1969	57.900963
1970	58.162563
1971	58.400105
1972	58.660997
1973	58.803161
1974	59.033482
1975	59.20674
1976	59.387721
1977	59.590733
1978	59.893159
1979	60.133997
1980	60.457764
1981	60.628011
1982	60.890397
1983	61.019947
1984	61.225189
1985	61.497159
1986	61.774916
1987	62.051924
1988	62.203056
1989	62.401549
1990	62.642375
1991	62.931333
1992	63.580869
1993	64.132927
1994	64.583231
1995	64.25937
1996	64.726165
1997	65.338407
1998	66.303203
1999	66.362845
2000	67.023326
2001	67.508816
2002	66.980872
2003	66.536402
2004	67.303367
2005	67.554665
2006	68.283841
2007	69.295081
2008	69.304259
2009	69.647565
2010	70.009771
2011	70.48874
2012	70.981129
2013	71.49239
2014	71.856055
2015	72.378261
2016	72.800679
2017	73.345832
2018	73.757262
2019	74.163823
2020	73.402354
2021	67.92499
2022	68.594589