Year	% of cohort
1982	79.4885330200195
1985	88.760612487793
1986	84.931022644043
1987	90.0617980957031
1988	97.7156524658203
1991	88.6339416503906
1992	97.1966705322266
1993	97.1065521240234
1994	98.7688598632812
1995	88.2203598022461
1997	96.8147811889648
1998	98.9330062866211
1999	95.1144332885742
2000	98.8735809326172
2001	99.5451812744141
2003	99.0107116699219
2004	99.4957809448242
2011	99.0967102050781
2015	98.2640686035156
2016	96.4435195922852
2017	98.83544921875
2018	96.9775695800781