Year	% of cohort
1960	52.659246
1961	53.232708
1962	53.773863
1963	54.456895
1964	54.692529
1965	55.239363
1966	55.689469
1967	56.060244
1968	56.362515
1969	56.44663
1970	56.318297
1971	56.690794
1972	56.301341
1973	55.775528
1974	55.85849
1975	55.919139
1976	55.985754
1977	56.935455
1978	56.926925
1979	57.223445
1980	57.452369
1981	57.511952
1982	57.923618
1983	58.26266
1984	58.526183
1985	59.07672
1986	59.288682
1987	60.407747
1988	61.420411
1989	62.380004
1990	63.076871
1991	63.765432
1992	65.03854
1993	65.931859
1994	66.723909
1995	67.320033
1996	67.916646
1997	68.338218
1998	68.712632
1999	69.048048
2000	69.227892
2001	69.653394
2002	69.999427
2003	70.244069
2004	70.555062
2005	70.901601
2006	71.050403
2007	71.373772
2008	71.545938
2009	71.667088
2010	71.872319
2011	71.976803
2012	72.128073
2013	72.114928
2014	72.516508
2015	72.664011
2016	72.81778
2017	72.995405
2018	73.279214
2019	73.606736
2020	74.097411
2021	67.509029
2022	74.008519