Year	% of cohort
1977	91.2683486938477
1978	91.9313201904297
1983	95.7294082641602
1985	91.3716888427734
1992	83.9800872802734
2000	92.4755477905273
2004	89.054573059082
2005	91.5549774169922
2019	91.3237762451172