Year	% of cohort
1971	63.2677116394043
1972	62.9542083740234
1973	62.3449211120605
1974	62.2359199523926
1975	63.5041694641113
1976	64.3392333984375
1977	65.6884078979492
1978	65.4464111328125
1979	65.5757064819336
1980	65.2177200317383
1981	65.702018737793
1982	65.8308181762695
1983	66.3618698120117
1984	66.1533966064453
1985	66.9618301391602
1986	68.2052688598633
1987	70.1504821777344
1988	70.395751953125
1989	70.5052795410156
1990	71.8057403564453
1991	72.0602722167969
1992	72.5256576538086
1993	73.1210098266602
1994	73.2794189453125
1995	74.048942565918
1996	74.0028533935547
1997	74.0108337402344
1998	73.5755233764648
1999	73.7505111694336
2000	73.1542205810547
2001	74.0660705566406
2002	74.0382614135742
2003	73.6148681640625
2004	73.9014587402344
2005	74.049186706543
2006	73.9755783081055
2007	74.0454406738281
2008	75.734977722168
2009	75.4506225585938
2010	75.1794967651367
2011	76.1438522338867
2012	75.5576934814453
2013	76.1838302612305
2014	78.8230972290039
2015	78.6725769042969
2016	78.8212890625
2017	79.4954833984375
2018	78.7829971313477
2019	81.3172378540039
2020	81.882682800293
2021	82.5868911743164