Year	% of cohort
1970	60.5283012390137
1974	58.8943901062012
1975	63.4564094543457
1998	87.5820388793945
1999	97.4088363647461
2000	91.1738510131836
2001	90.6227111816406
2002	82.2861709594727
2003	97.3456573486328
2004	87.9300765991211
2005	95.8808212280273
2006	95.2816467285156
2007	98.7339401245117
2008	94.6034774780273
2009	96.7308197021484
2010	93.1193313598633
2011	97.4299697875977
2012	94.9498825073242
2013	95.8035125732422
2014	95.034538269043
2015	97.0606994628906
2016	93.8259963989258
2017	93.9593963623047
2018	93.8678131103516
2019	93.3720092773438
2020	96.2967300415039