Year	% of cohort
1960	38.177224
1961	38.712721
1962	40.090312
1963	40.745752
1964	41.121202
1965	42.132544
1966	42.965754
1967	43.592336
1968	44.743386
1969	45.326409
1970	45.970501
1971	46.633437
1972	47.4597
1973	45.570378
1974	44.534967
1975	50.511554
1976	51.393283
1977	52.247955
1978	53.159406
1979	53.902112
1980	54.666257
1981	55.464584
1982	55.849457
1983	56.697342
1984	57.371683
1985	58.140589
1986	58.916574
1987	59.27639
1988	59.814944
1989	60.507851
1990	60.979493
1991	61.837918
1992	62.044436
1993	62.574961
1994	63.042581
1995	64.116111
1996	64.5034
1997	65.370191
1998	59.688414
1999	66.494022
2000	66.833048
2001	67.162196
2002	68.270529
2003	68.42447
2004	68.488926
2005	69.575023
2006	69.704913
2007	69.9174
2008	69.891246
2009	70.763515
2010	70.784671
2011	71.123489
2012	71.486028
2013	71.700497
2014	72.628545
2015	72.767566
2016	72.894004
2017	73.025431
2018	73.165996
2019	73.232388
2020	70.126491
2021	67.257172
2022	68.595053