Year	% of cohort
1973	73.6216430664062
1977	95.5815582275391
1978	94.8338623046875
1979	92.6552581787109
1980	91.9049606323242
1981	92.956672668457
1984	96.5213165283203
1985	97.9775772094727
1986	96.6462326049805
1991	98.5627899169922
1992	97.7635498046875
1994	94.3851089477539
1995	98.0596618652344
1996	98.064567565918
1997	97.6015014648438
1998	97.3091583251953
1999	98.6088333129883
2000	97.9591827392578
2001	99.3371810913086
2002	97.6765823364258
2006	96.7631530761719
2007	95.9025802612305
2008	83.4477386474609
2010	96.5756607055664
2011	95.5725479125977
2012	98.4854125976562
2013	97.2406311035156
2014	97.1507720947266
2016	94.8501892089844
2018	97.4531936645508
2019	98.9021224975586
2020	96.1805419921875
2021	96.7650527954102