Year	% of cohort
1970	64.0363082885742
1973	90.8787689208984
1974	90.146369934082
1975	88.0867691040039
1976	90.6235504150391
1977	84.5873031616211
1978	88.6643676757812
1979	94.9684219360352
1980	82.377311706543
1981	86.3960266113281
1982	89.0996932983398
1983	87.1612396240234
1984	91.4446487426758
1985	89.637580871582
1986	91.9829711914062
1987	89.8316802978516
1989	86.2313003540039
1990	94.2224578857422
1991	84.0339736938477
1992	89.1864471435547
1993	88.7150421142578
1994	86.8016891479492
1995	89.9220962524414
1998	87.5558624267578
1999	86.6023712158203
2000	89.0275192260742
2001	88.2512512207031
2002	89.3514709472656
2003	90.1663208007812
2004	89.6708984375
2005	89.0558700561523
2006	78.8461074829102
2007	79.6043319702148
2008	96.5928726196289
2012	96.3005065917969