Year	% of cohort
1960	37.848041
1961	38.062682
1962	38.045239
1963	38.428793
1964	38.879601
1965	36.596827
1966	38.194045
1967	38.007117
1968	38.101716
1969	37.470739
1970	37.524239
1971	37.394923
1972	12.734895
1973	28.723559
1974	37.348234
1975	37.107611
1976	37.571703
1977	38.254508
1978	38.481513
1979	39.683457
1980	40.817937
1981	42.032212
1982	42.971769
1983	43.755418
1984	44.229376
1985	44.080319
1986	43.279227
1987	42.161823
1988	35.679841
1989	38.662741
1990	37.318696
1991	35.855338
1992	34.756892
1993	25.136744
1994	35.335376
1995	35.878027
1996	36.697735
1997	38.190665
1998	40.261144
1999	41.645833
2000	42.275707
2001	43.806274
2002	45.574012
2003	46.672097
2004	48.165348
2005	49.692475
2006	50.750037
2007	51.701861
2008	53.744704
2009	54.415462
2010	54.929772
2011	55.934377
2012	57.077819
2013	58.314381
2014	59.408415
2015	60.835326
2016	61.151348
2017	62.591085
2018	62.860168
2019	64.306989
2020	62.55873
2021	62.255377
2022	62.685038