Year	% of cohort
1974	51.8251113891602
1975	57.4108200073242
1976	68.1865615844727
1977	63.9450302124023
1978	73.9624633789062
1979	68.0129470825195
1980	69.5901718139648
1981	70.6045989990234
1982	73.9730987548828
1983	73.825309753418
1984	72.8575668334961
1985	76.2403717041016
1986	76.8329467773438
1987	74.4878387451172
1988	76.9873962402344
1989	75.1257171630859
1990	76.4373779296875
1991	79.5389785766602
1992	81.5025634765625
1993	84.1890563964844
1994	84.6353530883789
1995	85.8653564453125
1996	85.5722122192383
1998	88.9443588256836
1999	89.0037231445312
2000	88.2877578735352
2001	90.4751815795898
2002	92.8448028564453
2003	92.6436462402344
2004	93.8374786376953
2005	94.35302734375
2006	94.6208114624023
2007	93.9351196289062
2008	95.9585189819336
2009	95.9697113037109
2010	96.4677429199219
2011	96.7403335571289
2012	95.6582336425781
2013	96.6895294189453
2014	96.8546829223633
2015	93.2108688354492
2016	99.0864791870117
2017	96.3908081054688
2018	97.8125686645508
2019	97.6186599731445
2020	98.6749801635742
2021	98.1004791259766