Year	% of cohort
1971	75.4911880493164
1972	74.8612518310547
1973	74.9176712036133
1974	77.3182678222656
1975	78.2315902709961
1976	77.8170394897461
1977	78.2133865356445
1978	78.3517608642578
1979	78.2920989990234
1980	78.4746780395508
1981	78.6334228515625
1982	78.6081008911133
1983	76.7362976074219
1984	77.0362777709961
1985	76.3579330444336
1986	77.2538528442383
1987	77.2239837646484
1988	76.9357376098633
1989	75.8170928955078
1990	77.0615692138672
1991	75.5690002441406
1992	76.1709671020508
1993	76.6674270629883
1994	75.7728805541992
1995	75.3037414550781
1996	76.4205169677734
1997	75.7090911865234
1998	76.1706314086914
1999	75.568229675293
2000	76.1225280761719
2001	75.5691223144531
2002	71.6719589233398
2003	70.4623718261719
2004	68.223030090332
2005	69.0651168823242
2006	56.4870986938477
2007	56.2489585876465
2008	70.8564224243164
2009	62.2711715698242
2010	63.3629188537598
2011	63.8034515380859
2012	63.1044616699219
2013	63.2311515808105
2014	63.0932083129883
2015	61.8849105834961
2016	59.5433616638184
2017	60.7075691223145
2018	61.7802314758301
2019	62.3842582702637
2020	62.5351486206055
2021	61.8269195556641