Year	% of cohort
1970	27.3899803161621
1971	21.7187004089355
1972	26.318920135498
1976	25.7368392944336
1977	22.593240737915
1978	21.2594203948975
1979	33.0380783081055
1982	33.485538482666
1983	20.3311405181885
1984	24.3122596740723
1985	17.051139831543
1986	29.8597106933594
1987	29.7580394744873
1992	48.2286109924316
1993	50.5252418518066
1994	36.4992294311523
1999	41.8203887939453
2000	47.7661018371582
2001	61.3907089233398
2002	48.6807518005371
2003	51.5170288085938
2004	48.1641311645508
2005	46.227481842041
2006	40.0269203186035
2007	44.7103996276855