Year	% of cohort
1971	56.6334114074707
1999	93.7512512207031
2000	95.5775604248047
2001	96.3432693481445
2002	96.3149871826172
2003	96.9467620849609
2004	95.9419326782227
2005	95.901481628418
2006	96.5099487304688
2007	95.1964721679688
2008	95.5186309814453
2009	96.1617126464844
2010	94.0493774414062
2011	95.4216918945312
2012	94.7000503540039
2013	95.8551635742188
2014	94.4071273803711
2015	94.692008972168
2016	95.7740173339844
2017	95.7283020019531
2018	96.3109512329102
2019	95.4909362792969
2020	96.8824996948242
2021	93.874870300293