Year	% of cohort
1960	23.673467
1961	23.624102
1962	21.273033
1963	31.287847
1964	30.922329
1965	30.661549
1966	30.285112
1967	30.168622
1968	30.125122
1969	30.024971
1970	30.345375
1971	30.858677
1972	31.601042
1973	32.514639
1974	33.459818
1975	34.687522
1976	35.937557
1977	37.471763
1978	38.994966
1979	40.964998
1980	43.023506
1981	45.905772
1982	49.060086
1983	52.34983
1984	56.210847
1985	59.435635
1986	61.822895
1987	63.441744
1988	66.394681
1989	66.436999
1990	66.955496
1991	67.141284
1992	66.957495
1993	67.068133
1994	65.804872
1995	65.61704
1996	68.936917
1997	69.659158
1998	70.188257
1999	72.118659
2000	72.854115
2001	73.716491
2002	74.538624
2003	75.217467
2004	75.94082
2005	76.518745
2006	76.927154
2007	77.23793
2008	77.814889
2009	78.752864
2010	79.362624
2011	79.825681
2012	79.785149
2013	80.548538
2014	81.19455
2015	82.114127
2016	82.432133
2017	82.43197
2018	82.77979
2019	83.123122
2020	79.880051
2021	82.687117
2022	84.018003