Year	% of cohort
1960	37.69675
1961	38.847089
1962	40.112341
1963	41.208203
1964	42.993391
1965	44.56455
1966	46.153061
1967	47.661984
1968	49.515715
1969	51.434079
1970	53.474143
1971	55.457274
1972	57.469515
1973	58.942839
1974	60.840243
1975	61.907927
1976	63.031936
1977	64.057136
1978	65.087571
1979	66.051686
1980	67.185401
1981	68.281889
1982	69.209514
1983	69.505933
1984	70.447644
1985	70.759438
1986	71.039422
1987	71.955091
1988	72.065722
1989	72.299958
1990	72.50951
1991	73.418366
1992	73.586652
1993	73.676691
1994	73.769711
1995	73.9346
1996	74.342947
1997	74.68396
1998	74.962304
1999	76.4443
2000	78.315918
2001	78.769095
2002	79.253489
2003	82.30352
2004	82.718888
2005	83.124009
2006	83.537774
2007	83.894481
2008	84.264598
2009	84.630172
2010	85.011336
2011	85.366533
2012	85.796482
2013	86.078303
2014	86.478801
2015	86.8468
2016	87.069259
2017	87.357432
2018	87.594783
2019	87.806343
2020	87.289418
2021	87.185161
2022	87.710539