Year	% of cohort
1970	78.7281188964844
1971	78.9201507568359
1972	80.4746398925781
1973	75.5887069702148
1975	84.9536666870117
1976	77.7025833129883
1977	81.2524795532227
1978	84.1174163818359
1979	77.3283233642578
1980	82.3695297241211
1981	78.788459777832
1984	83.7311019897461
1985	86.6753082275391
1986	82.643180847168
1987	85.0294723510742
1988	83.0605926513672
1990	84.0865097045898
1991	84.9451065063477
1992	86.8487396240234
1993	89.2574234008789
1994	90.3233871459961
1995	89.0775909423828
1999	92.9586563110352
2000	94.5935821533203
2001	93.0716171264648
2004	89.6816177368164
2005	94.5534133911133
2006	89.1703491210938
2007	97.0943832397461
2008	96.7570114135742
2009	92.1633682250977
2010	94.1395568847656
2011	92.3613433837891
2012	91.1310119628906
2013	92.7437515258789
2014	95.0455932617188
2015	97.2595062255859
2020	97.8667221069336