Year	% of cohort
1973	83.0035934448242
1974	84.3411407470703
1979	87.1976623535156
1980	95.513786315918
1981	94.1773223876953
1982	93.3776779174805
1983	94.7931213378906
1984	95.5025177001953
1985	96.8174819946289
1986	90.65087890625
1987	92.420051574707
1991	91.2655792236328
1996	97.7769775390625
1999	95.5921173095703
2000	90.3182830810547
2001	98.5037994384766
2002	97.0955123901367
2003	82.6842193603516
2010	94.6645278930664
2015	96.3232803344727
2017	96.713493347168
2020	94.6941528320312