Year	% of cohort
1970	49.6545181274414
1973	81.8685531616211
1974	85.8075180053711
1975	81.6454162597656
1976	83.4788665771484
1977	74.8848876953125
1978	78.6002502441406
1979	86.7316436767578
1980	73.168083190918
1981	80.9086303710938
1983	85.0434112548828
1984	87.5458068847656
1985	88.1777114868164
1989	78.0843734741211
1991	76.9554290771484
1992	83.1286392211914
1993	83.6579513549805
1994	81.3920974731445
1995	85.6959228515625
1998	82.3395614624023
1999	82.0330123901367
2000	84.4707794189453
2001	83.6014099121094
2002	84.0167083740234
2003	85.0502471923828
2004	83.7789993286133
2005	86.8001098632812
2008	92.9721221923828
2012	94.0120468139648