Year	% of cohort
1960	47.87596
1961	48.358953
1962	49.337519
1963	50.332141
1964	51.349188
1965	52.064202
1966	52.575172
1967	52.757379
1968	52.844447
1969	52.778292
1970	52.963477
1971	53.216506
1972	53.609138
1973	54.040073
1974	54.898461
1975	55.891726
1976	56.845508
1977	57.588633
1978	58.449267
1979	59.315564
1980	60.153301
1981	60.153966
1982	61.281283
1983	62.543692
1984	63.327616
1985	64.280823
1986	65.094912
1987	66.22458
1988	67.661986
1989	68.176323
1990	69.12058
1991	69.880235
1992	70.122344
1993	70.620341
1994	71.406042
1995	72.285745
1996	72.870592
1997	73.537518
1998	73.559294
1999	73.825167
2000	74.487251
2001	74.920776
2002	75.317187
2003	75.058753
2004	75.416287
2005	75.899928
2006	76.309739
2007	76.634967
2008	76.969203
2009	77.176133
2010	77.508264
2011	77.940619
2012	78.142156
2013	78.332458
2014	79.204603
2015	79.175976
2016	80.070109
2017	80.915046
2018	81.020637
2019	80.851233
2020	80.185639
2021	78.707268
2022	78.617342