Year	% of cohort
1960	48.627533
1961	50.248414
1962	49.919488
1963	51.175133
1964	51.906966
1965	52.93505
1966	53.864138
1967	55.307296
1968	56.310562
1969	57.044522
1970	58.843374
1971	60.051093
1972	60.769798
1973	61.740477
1974	62.897826
1975	63.939342
1976	65.116175
1977	65.493594
1978	66.114977
1979	66.893587
1980	67.215769
1981	68.524005
1982	69.04284
1983	69.963335
1984	70.661329
1985	70.9906
1986	71.817111
1987	71.777848
1988	71.973095
1989	71.842392
1990	72.519358
1991	72.690522
1992	72.671411
1993	72.613139
1994	72.314855
1995	72.964199
1996	72.974921
1997	73.760121
1998	73.20657
1999	72.357985
2000	71.811351
2001	68.778024
2002	71.724089
2003	69.898203
2004	70.934775
2005	71.043412
2006	70.355879
2007	70.521845
2008	68.718476
2009	68.818966
2010	69.303603
2011	69.192585
2012	68.916251
2013	69.436928
2014	68.576492
2015	68.867666
2016	66.330104
2017	66.744879
2018	66.538065
2019	66.907071
2020	66.765276
2021	65.629434
2022	66.170857