Year	% of cohort
1960	53.860649
1961	54.471804
1962	55.078141
1963	56.154836
1964	58.547274
1965	60.545516
1966	62.892088
1967	66.098803
1968	66.515518
1969	67.06358
1970	67.219433
1971	68.150463
1972	68.980074
1973	69.824294
1974	70.795649
1975	71.413007
1976	72.099855
1977	71.271665
1978	72.897164
1979	75.047168
1980	73.413667
1981	78.005817
1982	77.297627
1983	76.340192
1984	78.721893
1985	79.251946
1986	80.044965
1987	80.315009
1988	81.638671
1989	82.541304
1990	83.650133
1991	84.438905
1992	85.249604
1993	85.624401
1994	86.178883
1995	86.65405
1996	87.137298
1997	87.903023
1998	88.445262
1999	88.971529
2000	89.470676
2001	90.287359
2002	90.467165
2003	90.559273
2004	91.064095
2005	91.492266
2006	92.021146
2007	92.334557
2008	92.870148
2009	93.255576
2010	93.438323
2011	93.743089
2012	93.92254
2013	94.334713
2014	94.84105
2015	95.063398
2016	95.379765
2017	95.659373
2018	95.800608
2019	96.011854
2020	95.210133
2021	95.427823
2022	96.040992