Year	% of cohort
1971	97.1065902709961
1972	98.7077026367188
1973	97.6333923339844
1974	70.4731674194336
1975	94.9616622924805
1976	98.4719696044922
1977	99.2339401245117
1978	99.1618881225586
1979	98.7603530883789
1980	98.8915328979492
1981	98.5121536254883
1982	99.4705963134766
1983	98.8335494995117
1984	98.8252487182617
1985	99.1708221435547
1986	98.6145172119141
1987	99.2065582275391
1988	99.2368469238281
1989	99.1254501342773
1990	98.4200897216797
1991	99.5043487548828
1992	99.0509262084961
1993	99.0276718139648
1994	99.4326400756836
1999	95.0104370117188
2000	99.0717163085938
2001	98.2016830444336
2002	98.0032424926758
2003	99.159049987793
2004	98.6382369995117
2005	98.7373504638672
2006	98.8828811645508
2007	95.3712921142578
2012	95.0144424438477
2013	92.2026672363281
2014	97.9340209960938
2015	98.3295135498047
2016	98.8522567749023
2019	97.5044708251953
2020	98.1106491088867