Year	% of cohort
1971	64.7388381958008
1972	66.3503189086914
1973	66.0062713623047
1974	66.5559921264648
1975	66.9869003295898
1976	66.6884994506836
1977	68.2695388793945
1978	68.3127593994141
1979	67.8860168457031
1980	68.1045074462891
1981	67.9729766845703
1982	68.7771606445312
1983	69.4309234619141
1984	69.8883438110352
1985	70.4304122924805
1986	71.2178421020508
1987	70.3429336547852
1988	67.744758605957
1989	68.7451477050781
1990	69.8168487548828
1991	69.33203125
1992	70.9583206176758
1993	70.7605285644531
1994	69.810417175293
1995	70.1204528808594
1996	70.0084381103516
1997	68.9906005859375
1998	68.2692794799805
1999	69.2775268554688
2000	70.2921295166016
2001	69.7072525024414
2002	69.1616668701172
2003	67.8028182983398
2004	68.133903503418
2005	67.7111282348633
2006	62.5640907287598
2007	59.6900901794434
2008	64.2422866821289
2009	59.3782806396484
2010	59.8587303161621
2011	60.7446708679199
2012	57.4060211181641
2013	55.3298606872559
2014	53.8284492492676
2015	54.6152801513672
2016	54.769458770752
2017	57.8616218566895
2018	59.199291229248
2019	60.7026290893555
2020	63.0297698974609