Year	% of cohort
1960	55.264662
1961	57.463328
1962	56.809143
1963	55.071208
1964	58.591727
1965	59.794737
1966	62.575413
1967	62.470129
1968	63.388111
1969	63.221105
1970	64.069664
1971	65.070052
1972	66.368802
1973	66.781475
1974	67.57176
1975	68.047254
1976	68.852744
1977	69.692026
1978	71.171819
1979	71.289597
1980	70.418238
1981	71.20893
1982	71.565116
1983	70.446349
1984	71.101316
1985	71.005742
1986	72.06785
1987	72.069468
1988	72.698414
1989	72.857891
1990	72.251687
1991	73.271355
1992	72.038929
1993	72.926129
1994	72.061072
1995	72.589793
1996	73.004384
1997	73.154629
1998	73.491353
1999	73.880207
2000	74.205002
2001	74.016165
2002	74.063694
2003	74.889395
2004	75.801993
2005	75.756959
2006	76.071801
2007	75.98611
2008	77.146806
2009	77.410255
2010	78.028477
2011	78.239068
2012	78.43548
2013	79.765053
2014	80.080931
2015	80.309543
2016	80.624324
2017	81.690629
2018	82.981678
2019	83.339785
2020	79.668451
2021	76.717225
2022	76.873377