Year	% of cohort
1960	42.289096
1961	43.043769
1962	43.879663
1963	44.800349
1964	45.777244
1965	46.791555
1966	47.876919
1967	48.967809
1968	50.002845
1969	51.013098
1970	52.0294
1971	52.933864
1972	53.486269
1973	54.325583
1974	54.796286
1975	55.154596
1976	55.423778
1977	54.325618
1978	55.838275
1979	56.112822
1980	56.434038
1981	56.755533
1982	57.090269
1983	57.510761
1984	57.938347
1985	58.465941
1986	59.113081
1987	59.818125
1988	60.615037
1989	61.432644
1990	62.24078
1991	63.100432
1992	63.8814
1993	64.552175
1994	65.158819
1995	65.660683
1996	66.115663
1997	66.589062
1998	67.048537
1999	67.543683
2000	67.990809
2001	68.375789
2002	68.666784
2003	68.848412
2004	68.905917
2005	68.866493
2006	68.750135
2007	68.653549
2008	68.626028
2009	68.733971
2010	68.912442
2011	69.190936
2012	69.477586
2013	69.817604
2014	70.179995
2015	70.578924
2016	71.099481
2017	71.611129
2018	72.079298
2019	72.52102
2020	72.80772
2021	72.938889
2022	73.439019