Year	% of cohort
1971	95.1667327880859
1972	95.1637878417969
1973	95.166130065918
1974	96.1892166137695
1975	97.1065368652344
1976	97.0659408569336
1977	96.4419937133789
1978	96.3308181762695
1979	96.7014083862305
1980	97.3313293457031
1981	97.1914367675781
1982	96.7272262573242
1983	96.9365615844727
1984	96.8808670043945
1985	97.4049835205078
1986	97.0200576782227
1987	96.8538208007812
1988	94.7930297851562
1989	94.5079574584961
1990	94.7830581665039
1991	97.2008972167969
1993	99.2608871459961
1994	91.0444869995117
1995	97.651611328125
1997	89.1418991088867
1998	100
1999	98.3254776000977
2000	99.2144088745117
2001	98.1627426147461
2002	99.2130508422852
2003	99.7670135498047
2004	99.2195892333984
2005	98.4497528076172
2006	97.3010025024414
2008	97.5577621459961
2009	99.3451309204102
2010	98.5322875976562
2011	98.4694290161133
2012	97.757209777832
2013	97.8210678100586
2014	97.9474563598633
2015	98.0044174194336
2016	93.8943634033203
2017	99.6115875244141
2018	99.5419235229492
2021	99.9117202758789