Year	% of cohort
1970	34.8869705200195
1971	29.3579006195068
1972	34.6766395568848
1976	36.6229782104492
1977	34.8365592956543
1978	28.9582691192627
1979	47.4796981811523
1982	47.2238082885742
1983	36.1376190185547
1984	62.0455284118652
1985	32.4159889221191
1986	46.136589050293
1987	43.0672302246094
1992	57.4942207336426
1993	56.4827499389648
1994	51.6861991882324
1999	52.9196090698242
2000	58.2732696533203
2001	67.2778701782227
2002	58.7975387573242
2003	62.5374183654785
2004	56.3892097473145
2005	57.337459564209
2006	51.067211151123
2007	55.1638412475586