Year	% of cohort
1971	55.3944702148438
1972	52.4187698364258
1973	56.487548828125
1974	67.819221496582
1975	60.7301788330078
1976	60.7700691223145
1977	64.3081970214844
1978	65.474250793457
1979	67.9190368652344
1980	67.8871002197266
1981	73.8027191162109
1982	73.4132690429688
1983	72.3070373535156
1984	73.6852035522461
1986	74.9685592651367
1987	72.6697082519531
1988	72.4788818359375
1989	71.4737167358398
1990	77.3351821899414
1991	67.8160705566406
1994	79.6783599853516
1998	68.8266067504883
1999	70.424201965332
2000	71.362060546875
2001	67.8553314208984
2002	75.0549087524414
2003	77.9238967895508
2004	76.0889282226562
2005	73.9217681884766
2006	82.0707015991211
2007	81.4811706542969
2008	82.6163177490234
2009	77.5999603271484
2011	83.5763931274414
2012	85.1978302001953
2013	82.7153167724609
2014	82.5364303588867
2015	84.5215911865234
2016	81.36083984375
2017	84.6902923583984
2018	74.101432800293
2019	73.2088165283203
2020	79.6180572509766
2021	65.1538162231445