Year	% of cohort
1970	30.6922798156738
1971	26.0961093902588
1972	30.6173496246338
1976	30.7998905181885
1977	27.2216205596924
1978	27.4343700408936
1979	39.9745407104492
1982	40.3827781677246
1983	31.0304298400879
1984	38.4991912841797
1985	25.7302494049072
1986	36.5566787719727
1987	33.4646301269531
1992	51.2471389770508
1993	51.9518699645996
1994	42.629508972168
1999	44.3422393798828
2000	50.5147590637207
2001	62.5077514648438
2002	51.7713012695312
2003	55.3570213317871
2004	50.9626808166504
2005	50.3467597961426
2006	43.4205894470215
2007	47.939338684082