Year	% of cohort
1988	82.07646728766628
1989	82.2570791435335
1990	86.16673259010781
1991	86.60217975843803
1992	87.94693667058218
1993	88.71656394952805
1994	89.77912360158311
1995	91.9083992265372
1996	92.50228162840521
2019	99.21619622640867