Year	% of cohort
1960	16.359598
1961	16.768353
1962	17.187532
1963	17.5276
1964	17.905566
1965	18.740341
1966	19.460738
1967	20.296964
1968	20.855784
1969	21.408231
1970	21.933928
1971	22.587642
1972	23.295751
1973	24.108852
1974	21.738656
1975	4.175041
1976	4.5419
1977	3.932613
1978	3.037143
1979	3.225847
1980	5.330948
1981	5.918759
1982	6.603473
1983	7.154547
1984	8.395877
1985	8.658044
1986	9.120054
1987	10.042401
1988	10.352092
1989	31.151191
1990	32.036398
1991	31.880491
1992	33.660249
1993	34.914097
1994	36.411343
1995	36.017085
1996	36.981282
1997	37.71607
1998	37.220676
1999	28.946268
2000	51.71484
2001	52.933598
2002	54.17108
2003	55.324959
2004	56.475847
2005	57.614578
2006	58.855453
2007	59.88399
2008	60.836635
2009	61.714085
2010	62.474736
2011	63.144464
2012	63.74595
2013	64.290278
2014	64.860211
2015	65.503303
2016	66.082765
2017	66.645602
2018	67.14021
2019	67.59123
2020	67.673493
2021	66.026554
2022	68.725182