Year	% of cohort
1982	93.4743499755859
1983	98.3235778808594
1984	97.3954925537109
1985	97.3457336425781
1986	98.4910125732422
1987	95.8196716308594
1988	98.7319412231445
1989	97.1042022705078
1990	98.3310317993164
1991	96.6737518310547
1992	99.5604019165039
1997	98.3032913208008
1998	98.2068176269531
1999	99.5926895141602
2000	98.3102722167969
2001	96.9457397460938
2002	98.6006927490234
2003	99.3861236572266
2004	97.0498123168945
2005	97.7834014892578
2006	98.8237380981445
2007	99.1506805419922
2008	95.9352493286133
2009	98.7904205322266
2010	98.4823608398438
2011	98.5076370239258
2012	95.8424682617188
2013	97.9197311401367
2014	97.800537109375
2015	97.8952484130859
2016	95.9351425170898
2017	96.3906402587891
2018	97.7183837890625
2019	96.1080780029297
2020	93.6820220947266