Year	% of cohort
1970	50.834659576416
1971	50.548999786377
1972	50.510570526123
1973	49.3680801391602
1974	50.2760810852051
1975	51.3600997924805
1976	52.7138595581055
1977	55.0457000732422
1978	55.9422187805176
1979	56.0732383728027
1980	56.3090591430664
1981	57.0359115600586
1982	57.187141418457
1983	58.667121887207
1984	59.284481048584
1985	60.6426315307617
1986	62.3050193786621
1987	66.4498901367188
1988	66.5932693481445
1989	66.5420379638672
1990	66.8490295410156
1991	66.8489608764648
1992	66.7497634887695
1993	67.2580184936523
1994	66.5733108520508
1995	67.3162307739258
1996	67.4933929443359
1997	67.7493362426758
1998	68.1174087524414
1999	68.495719909668
2000	67.214599609375
2001	68.1408004760742
2002	68.4476928710938
2003	69.3024520874023
2004	70.2299728393555
2005	70.800666809082
2006	71.7835083007812
2007	71.5302124023438
2008	73.1697463989258
2009	74.4620590209961
2010	74.4111328125
2011	75.2146682739258
2012	75.4562530517578
2013	77.7523803710938
2014	82.7105026245117
2015	82.2154769897461
2016	82.5850372314453
2017	82.1743927001953
2018	81.0116195678711
2019	85.5356597900391
2020	86.5341567993164
2021	87.7710876464844