Year	% of cohort
1972	85.4890518188477
1973	83.56494140625
1974	80.5327377319336
1975	83.4881896972656
1976	83.7448501586914
1977	83.5628204345703
1978	85.777473449707
1979	85.1748809814453
1980	84.2941665649414
1981	85.2821197509766
1982	88.3367309570312
1983	89.2699203491211
1984	92.1067428588867
1985	94.4832382202148
1986	91.5370712280273
1987	91.9985122680664
1988	90.5460586547852
1989	91.544319152832
1990	92.6258163452148
1991	93.3568267822266
1992	92.44677734375
1993	93.3130187988281
1994	91.0346221923828
1995	94.5699768066406
1996	94.8511199951172
1998	95.7249374389648
1999	96.1065368652344
2000	97.3965377807617
2001	97.26171875
2002	97.4750671386719
2003	97.391242980957
2004	97.128776550293
2005	95.6178131103516
2006	97.4880599975586
2007	97.2701797485352
2009	97.1044387817383
2010	95.1325531005859
2011	94.5527801513672
2012	97.6710510253906
2013	94.5389404296875
2014	94.6390228271484
2015	94.0604400634766
2016	95.9844665527344
2017	97.2509994506836
2018	91.8907470703125
2020	87.7981491088867
2021	93.4629135131836