Year	% of cohort
1960	32.248556
1961	32.557873
1962	32.959218
1963	33.257476
1964	33.415269
1965	29.199086
1966	32.931299
1967	32.623874
1968	32.796448
1969	31.86711
1970	32.442998
1971	32.353377
1972	7.128621
1973	22.522854
1974	32.58931
1975	32.656641
1976	32.677323
1977	33.006881
1978	33.167237
1979	34.19174
1980	35.075431
1981	36.41582
1982	37.563151
1983	38.40634
1984	38.46551
1985	37.935908
1986	36.651806
1987	34.948311
1988	26.300745
1989	31.148481
1990	29.722483
1991	28.896529
1992	28.822781
1993	18.113392
1994	28.944385
1995	28.51402
1996	28.829255
1997	30.674388
1998	32.544883
1999	34.357187
2000	33.361443
2001	34.690172
2002	37.760292
2003	39.65226
2004	41.745111
2005	43.268993
2006	44.535857
2007	45.973287
2008	46.854561
2009	48.003109
2010	49.459883
2011	50.426317
2012	51.433847
2013	52.468201
2014	53.331286
2015	52.84796
2016	54.32704
2017	55.468054
2018	55.409225
2019	56.284806
2020	53.673836
2021	53.964584
2022	54.57275