Year	% of cohort
1960	34.001252
1961	33.603521
1962	33.479567
1963	33.917806
1964	33.469332
1965	34.319654
1966	35.242412
1967	35.746334
1968	36.084014
1969	36.496543
1970	36.81767
1971	37.202471
1972	37.503677
1973	37.738034
1974	38.213167
1975	38.09903
1976	38.206804
1977	38.355064
1978	37.950963
1979	38.83623
1980	38.909571
1981	39.228329
1982	39.482506
1983	39.650434
1984	40.121564
1985	40.169818
1986	40.814656
1987	41.306725
1988	42.563753
1989	43.153199
1990	44.208048
1991	44.708748
1992	45.461769
1993	46.490758
1994	46.923057
1995	48.20885
1996	46.927976
1997	48.510508
1998	49.1441
1999	49.379693
2000	50.040469
2001	50.254543
2002	50.484565
2003	50.75476
2004	51.212616
2005	51.823279
2006	52.738267
2007	52.994962
2008	53.644619
2009	54.613277
2010	55.395022
2011	56.418874
2012	56.502541
2013	57.498463
2014	58.414212
2015	58.689932
2016	59.748482
2017	59.961169
2018	61.04112
2019	61.831292
2020	60.385997
2021	59.519162
2022	60.390727