Year	% of cohort
1960	34.160879
1961	35.302996
1962	36.179444
1963	37.187681
1964	38.365528
1965	39.743204
1966	41.259947
1967	42.715718
1968	44.206163
1969	45.394719
1970	46.243684
1971	46.72813
1972	36.884391
1973	47.133067
1974	47.204922
1975	47.33825
1976	47.560413
1977	46.47734
1978	38.501132
1979	29.696716
1980	49.280362
1981	49.30234
1982	49.850083
1983	42.715537
1984	39.6724
1985	39.746882
1986	42.513922
1987	40.928012
1988	48.256969
1989	54.231466
1990	55.146169
1991	56.968027
1992	57.362392
1993	57.896249
1994	58.58326
1995	59.226059
1996	59.877951
1997	60.552272
1998	59.370951
1999	61.441734
2000	61.608581
2001	61.590663
2002	61.530591
2003	61.571189
2004	61.832296
2005	62.516117
2006	63.560658
2007	64.700161
2008	66.064661
2009	67.275763
2010	68.220013
2011	69.05987
2012	69.685927
2013	70.203253
2014	70.760563
2015	71.385839
2016	72.089211
2017	72.704316
2018	73.133532
2019	73.210976
2020	68.502255
2021	72.701144
2022	74.237346