Year	% of cohort
1970	56.0880889892578
1971	56.9558906555176
1972	57.0908584594727
1973	58.0444183349609
1974	61.5461006164551
1975	61.3282699584961
1976	60.7538604736328
1977	62.8857383728027
1978	60.7288589477539
1979	60.0825386047363
1980	59.6832885742188
1981	58.0409507751465
1982	60.1259117126465
1983	59.5627784729004
1984	59.1794281005859
1985	61.1379318237305
1986	62.4438285827637
1987	60.4062004089355
1988	57.758731842041
1989	57.6245002746582
1990	58.2837715148926
1991	57.5916290283203
1992	59.9817886352539
1993	59.4075508117676
1994	57.1781883239746
1995	58.4275016784668
1996	56.722339630127
1997	55.9268989562988
1998	55.1069717407227
1999	57.3425903320312
2000	60.0752105712891
2001	63.410961151123
2002	61.5902099609375
2003	58.6375503540039
2004	59.9702987670898
2005	58.7287902832031
2006	60.2782287597656
2007	58.531681060791
2008	56.1226997375488
2009	53.7484283447266
2010	53.2089881896973
2011	55.0017013549805
2012	52.531608581543
2013	50.8125190734863
2014	50.7517318725586
2015	51.7853813171387
2016	51.7111701965332
2017	54.3591613769531
2018	55.2934188842773
2019	56.404541015625
2020	58.2626113891602
2021	58.111141204834