Year	% of cohort
1970	64.6779403686523
1971	63.4506988525391
1972	63.132438659668
1973	62.4392013549805
1974	62.3732299804688
1975	63.7165489196777
1976	64.6781997680664
1977	66.1435165405273
1978	65.848518371582
1979	65.9921035766602
1980	65.6261367797852
1981	66.0910797119141
1982	66.4442291259766
1983	66.9079208374023
1984	66.7296295166016
1985	67.5026016235352
1986	68.6701812744141
1987	70.4499816894531
1988	70.5780181884766
1989	70.7214736938477
1990	72.0893783569336
1991	72.3624877929688
1992	72.7501220703125
1993	73.3892517089844
1994	73.6255035400391
1995	74.55908203125
1996	74.5512466430664
1997	74.6544494628906
1998	74.4169692993164
1999	74.5084762573242
2000	74.1513824462891
2001	75.4312515258789
2002	75.0279388427734
2003	74.5496063232422
2004	74.7440490722656
2005	75.0598678588867
2006	74.8465270996094
2007	74.7595977783203
2008	76.4279403686523
2009	76.2691192626953
2010	75.9910736083984
2011	76.9924774169922
2012	76.3705215454102
2013	77.1689376831055
2014	80.0352935791016
2015	80.0372924804688
2016	79.6488418579102
2017	80.2100677490234
2018	80.0719299316406
2019	82.5469284057617
2020	82.9024887084961
2021	83.5583267211914