Year	% of cohort
1971	45.3067893981934
1972	45.8776817321777
1973	49.125919342041
1975	47.6890907287598
1976	58.2025413513184
1977	56.0845985412598
1978	61.393669128418
1979	42.051929473877
1980	37.1326713562012
1982	40.8833808898926
1983	35.5741500854492
1984	39.384349822998
1985	37.5266304016113
1986	40.1247901916504
1987	41.0346488952637
1999	64.5451812744141
2000	83.3722229003906
2001	75.8433380126953
2002	66.1148910522461
2003	78.4265594482422
2004	80.3919525146484
2005	73.521598815918
2007	76.3758773803711
2008	79.2055435180664
2009	77.3366088867188
2010	75.4931106567383
2011	61.5925102233887