Year	% of cohort
1972	66.9642486572266
1973	65.2008209228516
1974	67.0364685058594
1975	71.2214813232422
1976	67.7611999511719
1977	74.0724792480469
1978	68.2107009887695
1979	70.96923828125
1980	75.7129516601562
1992	78.7846069335938
1998	87.8934631347656
1999	87.4623031616211
2000	86.1014709472656
2001	83.6525192260742
2003	89.7171325683594
2004	90.279167175293
2005	89.4717178344727
2006	93.1769409179688
2007	86.1862030029297
2008	91.0385818481445
2009	93.1551132202148
2010	85.0634384155273
2011	78.8386688232422
2013	92.5640487670898
2016	94.5240936279297
2020	96.5155563354492
2021	98.4859924316406