Year	% of cohort
1970	49.3296699523926
1971	60.8151893615723
1972	65.7865371704102
1973	67.0322494506836
1974	64.7076110839844
1975	65.0533676147461
1976	64.5870132446289
1977	63.3097114562988
1978	64.3521118164062
1979	65.5585479736328
1980	70.0702285766602
1981	64.7018203735352
1982	63.7928886413574
1983	67.3891830444336
1984	68.8623809814453
1985	64.4267578125
1986	72.0744018554688
1987	69.3150405883789
1988	66.3391494750977
1989	73.3939971923828
1990	66.3662109375
1991	69.1311874389648
1992	69.0474700927734
1993	72.5494232177734
1994	77.2876892089844
1995	59.6186714172363
1996	67.9870910644531
1997	69.1712417602539
1998	75.449089050293
1999	66.196662902832
2000	63.8818511962891
2001	54.286750793457
2002	70.9184188842773
2004	75.1637573242188
2005	85.8963394165039
2006	73.5517196655273
2009	86.710563659668
2012	77.3734283447266
2013	81.4866409301758
2014	82.487922668457
2015	84.6615524291992
2016	86.4170074462891
2018	86.3901596069336