Year	% of cohort
1970	48.7224807739258
1978	69.6351089477539
1980	69.5275192260742
1983	79.9578018188477
1984	84.0146331787109
1991	72.0586166381836
1992	80.2547378540039
1993	79.1381607055664
1994	77.9233779907227
1995	80.5302810668945
1998	78.0539321899414
1999	78.6438293457031
2000	81.0491790771484
2001	81.1246337890625
2002	80.5949783325195
2003	82.5905303955078
2004	79.9478225708008
2005	84.7411270141602
2008	91.3327331542969
2012	92.6852035522461