Year	% of cohort
1978	84.8731918334961
1979	83.2651672363281
1980	82.0533981323242
1981	82.9782562255859
1982	84.8978729248047
1983	83.279182434082
1984	82.9909362792969
1985	83.9329833984375
1986	83.407356262207
1987	82.7565689086914
1988	82.2137222290039
1989	81.4699020385742
1990	80.8868179321289
1991	79.4939804077148
1992	79.0058898925781
1993	80.5177764892578
1994	81.0972366333008
1995	76.339111328125
1996	80.7283706665039
1997	81.6413497924805
1998	81.5999526977539
1999	78.9704513549805
2000	82.3367004394531
2001	81.5063095092773
2002	82.2480316162109
2003	83.1482696533203
2004	82.4642868041992
2005	82.4335098266602
2006	82.2393035888672
2007	83.1088180541992
2008	81.0952835083008
2009	81.699821472168
2010	82.7530364990234
2011	82.0897903442383
2012	85.3394165039062
2013	82.6531295776367
2014	85.0306777954102
2015	86.4235916137695
2016	81.1905670166016
2017	77.0232009887695
2018	81.7410888671875
2019	79.6917572021484
2020	78.6703186035156