Year	% of cohort
1960	57.220839
1961	57.940051
1962	58.636526
1963	59.407877
1964	60.149289
1965	60.888811
1966	61.637319
1967	62.347746
1968	63.10247
1969	63.83766
1970	64.523034
1971	65.285141
1972	66.096368
1973	66.867001
1974	67.701404
1975	68.712843
1976	69.661155
1977	70.628642
1978	71.545206
1979	72.243338
1980	73.093221
1981	73.670345
1982	74.234096
1983	74.674375
1984	75.270978
1985	71.940375
1986	76.420625
1987	76.91673
1988	77.696872
1989	78.292449
1990	78.778714
1991	79.154824
1992	79.540898
1993	79.905204
1994	80.238238
1995	80.675272
1996	81.093027
1997	81.578565
1998	82.004772
1999	82.253617
2000	82.877181
2001	83.132961
2002	83.709789
2003	84.203444
2004	84.621934
2005	85.047851
2006	85.482208
2007	85.890236
2008	86.308061
2009	86.689212
2010	86.943231
2011	87.199209
2012	87.432874
2013	87.580881
2014	87.693704
2015	87.767944
2016	87.830218
2017	87.824651
2018	87.895772
2019	87.916228
2020	85.747833
2021	82.22291
2022	83.716544