Year	% of cohort
1973	64.5463180541992
1977	96.6316375732422
1978	91.1228713989258
1982	97.6756896972656
1983	88.7970886230469
1984	82.6571197509766
1985	91.5917434692383
1986	85.3720932006836
1987	91.1333694458008
1988	96.1255569458008
1989	97.4086990356445
1990	96.247802734375
1991	80.2681884765625
1992	88.0572204589844
1993	100
1994	97.3732299804688
1995	81.3516998291016
1996	83.1893463134766
1997	91.6478729248047
1998	96.771369934082
1999	92.5460891723633
2000	95.0666580200195
2001	95.5749664306641
2003	93.3530502319336
2004	94.9103012084961
2005	97.0696411132812
2006	96.6442337036133
2010	84.5492935180664
2012	90.8167037963867