Year	% of cohort
1960	80.133096
1961	80.006764
1962	80.825242
1963	80.746301
1964	81.016928
1965	80.380196
1966	80.635676
1967	80.331642
1968	80.552058
1969	80.934911
1970	80.743163
1971	81.193258
1972	81.236247
1973	81.662408
1974	81.038819
1975	81.799876
1976	81.940649
1977	81.607243
1978	82.630077
1979	83.112773
1980	82.407769
1981	83.83386
1982	83.358504
1983	83.970768
1984	84.734785
1985	83.891397
1986	84.456503
1987	84.119898
1988	85.298206
1989	85.216769
1990	85.179245
1991	86.102307
1992	87.09965
1993	86.65249
1994	87.194957
1995	87.00142
1996	87.022427
1997	87.856279
1998	88.302318
1999	88.347488
2000	88.939091
2001	89.061494
2002	89.408889
2003	89.625169
2004	89.642614
2005	90.296818
2006	90.511505
2007	90.577684
2008	90.62003
2009	90.857029
2010	91.262708
2011	91.123031
2012	91.59625
2013	91.539937
2014	91.518152
2015	91.63551
2016	91.713723
2017	91.717106
2018	91.778501
2019	91.838501
2020	92.026803
2021	91.611085
2022	92.345759