Year	% of cohort
1991	95.9241409301758
1992	95.3125991821289
1993	95.0936965942383
1994	95.2174911499023
1995	95.6528701782227
1996	95.3046417236328
1997	94.96484375
1998	95.6020812988281
1999	95.6614379882812
2000	96.1644821166992
2001	96.2954864501953
2002	96.2340927124023
2003	96.4876403808594
2004	96.6723403930664
2005	96.6008834838867
2006	96.4592514038086
2007	95.8526229858398
2008	95.6780395507812
2009	96.765251159668
2010	96.3090667724609
2011	95.7768325805664
2012	95.9022064208984
2013	96.2109527587891
2014	95.1407928466797
2015	96.8782272338867
2016	97.5889434814453
2017	98.0091018676758
2018	98.1042785644531
2019	98.2498474121094
2020	98.1456298828125
2021	98.2524871826172