Year	% of cohort
1973	68.6248474121094
1977	91.245979309082
1978	87.8373794555664
1979	91.900390625
1982	94.9305725097656
1983	86.8710327148438
1984	78.0261077880859
1985	86.1343231201172
1986	82.0741424560547
1987	87.3470916748047
1988	93.7820434570312
1989	95.2410278320312
1990	94.1010665893555
1991	74.6146774291992
1992	85.1071319580078
1993	96.8466186523438
1994	95.3983764648438
1995	77.4282913208008
1996	79.7721786499023
1997	90.3544311523438
1998	96.2935333251953
1999	89.459358215332
2000	93.9492034912109
2001	94.0847702026367
2003	94.0512619018555
2004	95.2197494506836
2005	97.9388732910156
2006	96.6817169189453
2010	84.4456634521484
2012	91.9590072631836