Year	% of cohort
1970	50.9758110046387
1971	50.6489715576172
1972	50.3162689208984
1973	50.9708786010742
1974	51.9121398925781
1975	52.398021697998
1976	52.9950790405273
1977	54.2049789428711
1978	54.7436790466309
1979	55.8230590820312
1980	56.1338386535645
1981	57.0586013793945
1982	57.3661499023438
1983	58.046558380127
1984	58.6587791442871
1985	59.7825012207031
1986	61.4771003723145
1987	66.4623794555664
1988	66.9048233032227
1989	66.9976196289062
1990	67.0613403320312
1991	66.8019027709961
1992	66.800048828125
1993	66.6294021606445
1994	66.3828430175781
1995	66.6427230834961
1996	66.9452285766602
1997	67.163459777832
1998	67.6279296875
1999	67.9432983398438
2000	66.3845367431641
2001	67.4508209228516
2002	67.2775192260742
2003	67.9715576171875
2004	68.4869003295898
2005	69.3409423828125
2006	68.8604965209961
2007	69.8302612304688
2008	72.6720581054688
2009	73.005989074707
2010	72.8089599609375
2011	74.3027725219727
2012	75.1777420043945
2013	77.533821105957
2014	82.4228973388672
2015	81.2645111083984
2016	80.5060729980469
2017	79.8771896362305
2018	78.5866088867188
2019	82.9333724975586
2020	83.016227722168
2021	84.3938217163086