Year	% of cohort
1970	59.8137588500977
1971	61.765869140625
1972	64.0106735229492
1973	68.1324996948242
1974	62.4599418640137
1975	61.3396415710449
1976	62.5902900695801
1977	63.1673698425293
1978	64.8829116821289
1979	66.7060317993164
1980	67.2315368652344
1981	67.3030395507812
1982	66.9715728759766
1983	66.7432022094727
1984	69.1615905761719
1985	69.0094680786133
1986	70.8328704833984
1987	69.2341918945312
1988	69.4873886108398
1989	70.1976470947266
1990	70.4539566040039
1991	68.8110961914062
1992	70.3904571533203
1993	75.4654312133789
1994	73.6644287109375
1995	71.3291015625
1996	72.2842712402344
1997	73.584602355957
1998	72.2690963745117
1999	72.2594528198242
2000	72.7354736328125
2001	71.4487915039062
2002	73.8124237060547
2003	72.2025909423828
2004	72.0999069213867
2005	72.2697067260742
2006	70.465950012207
2007	72.7722396850586
2008	72.4715728759766
2009	72.2969512939453
2010	71.7126770019531
2011	73.7412414550781
2012	72.3046112060547
2013	74.5997619628906
2014	74.3916778564453
2015	74.9296035766602
2016	75.2835235595703
2017	75.7807922363281
2018	76.120361328125
2019	75.8652725219727