Year	% of cohort
1960	70.074946
1961	70.87259
1962	70.962054
1963	71.674151
1964	71.758737
1965	71.913435
1966	71.91093
1967	72.571112
1968	72.678398
1969	72.755225
1970	72.773917
1971	72.88786
1972	72.912618
1973	73.516198
1974	73.595509
1975	70.782537
1976	30.506443
1977	64.675215
1978	64.851828
1979	64.975366
1980	64.968304
1981	65.681782
1982	46.629603
1983	70.299652
1984	71.129633
1985	71.231726
1986	72.036011
1987	67.76277
1988	67.950702
1989	77.059098
1990	77.220305
1991	79.061055
1992	79.003424
1993	79.597451
1994	80.001815
1995	80.113065
1996	80.725855
1997	81.980809
1998	82.184552
1999	83.018155
2000	83.809643
2001	84.652241
2002	86.115007
2003	86.558781
2004	87.206191
2005	87.546027
2006	88.426008
2007	88.900718
2008	89.122362
2009	89.428434
2010	89.671223
2011	89.914017
2012	90.112561
2013	90.259366
2014	90.496411
2015	90.760087
2016	91.104423
2017	91.310376
2018	91.303351
2019	90.889407
2020	89.642735
2021	86.089341
2022	85.227192