Year	% of cohort
1960	48.106612
1961	48.715471
1962	47.697465
1963	44.764421
1964	49.340853
1965	50.812693
1966	51.523341
1967	51.976834
1968	52.991584
1969	53.837986
1970	55.508317
1971	54.885155
1972	52.86572
1973	56.881693
1974	60.132997
1975	61.812411
1976	61.257922
1977	62.746488
1978	62.891941
1979	63.912555
1980	65.447289
1981	67.484387
1982	67.491066
1983	66.173171
1984	66.565499
1985	69.028592
1986	71.123805
1987	73.649573
1988	72.81917
1989	71.069248
1990	71.039568
1991	73.427074
1992	75.118503
1993	75.045208
1994	75.171425
1995	74.611096
1996	75.073615
1997	76.488967
1998	76.974171
1999	77.834525
2000	78.601685
2001	77.90322
2002	79.144724
2003	79.056901
2004	79.554682
2005	80.365752
2006	80.985023
2007	80.389906
2008	80.795562
2009	81.305478
2010	81.570009
2011	82.395759
2012	83.091799
2013	82.867183
2014	83.299309
2015	83.424862
2016	84.065799
2017	84.525548
2018	83.636773
2019	83.895709
2020	82.691932
2021	81.17719
2022	82.483579