Year	% of cohort
1972	37.7474403381348
1973	39.4058990478516
1974	41.4850387573242
1975	41.8981094360352
1976	42.4870986938477
1977	44.2487106323242
1978	42.915699005127
1979	42.7681083679199
1980	41.7267112731934
1981	41.6585502624512
1982	44.42578125
1983	44.6440315246582
1984	45.4200401306152
1985	48.0335807800293
1986	49.1607208251953
1987	49.6777496337891
1988	50.3021011352539
1989	50.7237396240234
1990	51.675220489502
1991	51.3830108642578
1992	53.0068893432617
1993	52.1698112487793
1994	52.0539817810059
1995	52.8380508422852
1996	52.3458518981934
1997	52.7728881835938
1998	52.7344017028809
1999	54.7886810302734
2000	56.521240234375
2001	58.3821182250977
2002	57.8655586242676
2003	56.7037811279297
2004	58.0294990539551
2005	58.1927795410156
2006	58.1857681274414
2007	57.7871894836426
2008	56.5563087463379
2009	55.3928298950195
2010	54.5219688415527
2011	56.1314888000488
2012	54.9637603759766
2013	55.5170097351074
2014	56.3651390075684
2015	57.7585601806641
2016	57.7110290527344
2017	58.4994010925293
2018	59.0388793945312
2019	59.4459495544434
2020	60.3148307800293