Year	% of cohort
1970	66.1316070556641
1971	76.9665603637695
1972	76.9896087646484
1973	77.6766967773438
1974	74.2119827270508
1975	72.2899398803711
1976	75.0445098876953
1977	73.2203521728516
1978	74.2361526489258
1979	75.837532043457
1980	78.8572692871094
1981	72.243522644043
1982	74.2817687988281
1983	76.6294708251953
1984	77.5929565429688
1985	73.9931488037109
1986	81.3701782226562
1987	76.7755279541016
1988	77.354362487793
1989	79.2267532348633
1990	76.1976089477539
1991	77.1509323120117
1992	76.9046096801758
1993	78.721809387207
1994	86.690299987793
1995	74.4194488525391
1996	75.7793884277344
1997	80.5238189697266
1998	84.0305709838867
1999	80.0477294921875
2000	73.9839477539062
2001	73.3043365478516
2002	76.878791809082
2004	84.2522430419922
2005	93.9732131958008
2006	80.3304595947266
2009	96.2251205444336
2010	82.383918762207
2011	84.6769027709961
2012	89.3381271362305
2013	93.9266204833984
2014	93.8369293212891
2015	94.3931274414062
2016	95.1697387695312
2017	97.0777435302734
2018	97.3484497070312