Year	% of cohort
1970	85.5972366333008
1971	77.7541198730469
1972	76.7459182739258
1973	75.5081634521484
1974	76.5236968994141
1975	75.3356323242188
1976	80.6438980102539
1977	77.4959716796875
1978	74.2644500732422
1979	72.6765213012695
1980	72.9353790283203
1981	78.0009536743164
1982	74.3748626708984
1983	81.3124389648438
1984	78.1156311035156
1985	81.5345306396484
1986	79.7870712280273
1987	72.088981628418
1988	78.7105178833008
1999	90.1520385742188
2000	86.2065887451172
2001	88.025260925293
2004	82.4382171630859
2005	85.236328125
2006	88.2322311401367
2007	85.2136611938477
2008	86.8253707885742
2009	93.7548599243164
2010	93.8426132202148
2011	91.6096420288086
2012	93.2397384643555
2013	85.9613037109375
2019	94.0007629394531