Year	% of cohort
1970	87.6798629760742
1971	90.0627822875977
1972	92.2682113647461
1973	84.3524398803711
1976	82.2607727050781
1977	91.2882690429688
1984	95.8181610107422
1985	89.8342208862305
1986	94.3763275146484
1987	95.3532104492188
1988	96.7723083496094
1989	95.4466171264648
1990	94.4694595336914
1991	94.9286880493164
1992	95.7463836669922
1993	94.3154983520508
1994	95.8801422119141
1995	97.7382736206055
1996	94.244010925293
1997	95.7122268676758
1998	87.0549087524414
2000	88.5656280517578
2001	92.8949127197266
2002	88.4537582397461
2003	91.1658401489258
2004	94.8708114624023
2005	93.1352691650391
2006	94.3592071533203
2007	94.5199127197266
2008	95.3748168945312
2009	94.8350067138672
2010	94.1695785522461
2011	99.3121032714844
2012	99.1485900878906
2013	99.264778137207
2014	98.9350891113281
2015	99.6248779296875
2016	90.2796173095703
2019	99.1501007080078
2020	98.9259719848633