Year	% of cohort
1972	40.0930099487305
1973	41.4645881652832
1974	43.1003799438477
1975	42.6877593994141
1976	42.7689018249512
1977	44.728328704834
1978	43.7962989807129
1979	43.9339790344238
1980	43.8016815185547
1981	43.6440505981445
1982	44.8182601928711
1983	45.9469718933105
1984	46.8737297058105
1985	48.8438110351562
1986	50.0194282531738
1987	50.3266906738281
1988	50.1884803771973
1989	50.3338890075684
1990	51.4219512939453
1991	51.3310508728027
1992	53.3489685058594
1993	53.1749382019043
1994	52.8971214294434
1995	54.2709007263184
1996	53.7118606567383
1997	53.572940826416
1998	52.8124618530273
1999	55.3112411499023
2000	57.339298248291
2001	59.9687614440918
2002	60.132640838623
2003	58.398738861084
2004	58.847728729248
2005	58.1048011779785
2006	59.4303207397461
2007	58.2872314453125
2008	56.4883995056152
2009	54.1458702087402
2010	53.7433891296387
2011	54.5456581115723
2012	52.6497611999512
2013	50.880931854248
2014	50.9290008544922
2015	52.1159706115723
2016	52.5944519042969
2017	55.0342102050781
2018	54.9933090209961
2019	55.8641510009766
2020	57.5735015869141