Year	% of cohort
1960	44.534588
1961	44.627062
1962	44.667103
1963	44.895343
1964	45.485982
1965	45.430763
1966	45.244334
1967	45.290011
1968	44.774008
1969	44.750955
1970	45.403012
1971	45.324323
1972	45.471936
1973	45.974265
1974	46.45826
1975	47.014067
1976	47.672936
1977	47.749427
1978	48.485641
1979	49.18332
1980	49.073354
1981	49.518519
1982	49.303793
1983	49.641704
1984	50.255899
1985	50.886279
1986	51.876966
1987	52.61246
1988	53.551902
1989	54.309112
1990	54.459084
1991	54.732227
1992	54.848353
1993	54.364681
1994	53.920691
1995	54.635739
1996	55.163401
1997	56.005534
1998	56.494433
1999	57.137726
2000	57.032471
2001	56.636887
2002	57.655477
2003	58.567849
2004	58.490306
2005	59.507172
2006	59.610317
2007	60.31853
2008	60.370688
2009	61.519216
2010	61.3976
2011	62.642794
2012	63.882601
2013	63.915595
2014	65.3948
2015	65.367973
2016	66.940502
2017	66.911356
2018	67.052012
2019	68.421618
2020	67.473813
2021	66.586328
2022	66.77967