Year	% of cohort
1977	11.1850595474243
1978	23.5003700256348
1993	73.7038803100586
1997	78.362548828125
1998	79.0005493164062
1999	85.8253707885742
2000	85.2372894287109
2005	87.7407302856445
2008	94.8598327636719
2009	91.6940231323242
2010	93.4257888793945
2011	98.6957473754883
2016	93.1040878295898