Year	% of cohort
1972	82.2639923095703
1973	86.8180465698242
1975	78.827392578125
1976	79.6265029907227
1977	76.6228637695312
1978	77.1090087890625
1983	85.3910598754883
1984	80.3696517944336
1989	66.2222366333008
1991	58.9420318603516
1993	67.5493469238281
1995	39.9500198364258
2002	66.9851379394531
2007	75.2541198730469