Year	% of cohort
1970	92.1159591674805
1971	91.8981170654297
1972	91.8692321777344
1973	92.0142288208008
1974	92.3502502441406
1975	92.4329071044922
1976	92.4350891113281
1977	92.8204498291016
1978	93.0465774536133
1979	93.1694488525391
1980	93.1143569946289
1981	93.421516418457
1982	93.3734817504883
1983	93.5840606689453
1984	93.8915176391602
1985	93.9914321899414
1986	93.5500869750977
1987	93.4554977416992
1988	93.6266326904297
1989	93.7426300048828
1990	93.7914428710938
1991	93.7920913696289
1992	93.8372802734375
1993	94.0765686035156
1994	93.7113494873047
1995	93.7912063598633
1996	93.373046875
1997	93.4782867431641
1998	94.043571472168
1999	94.0387878417969
2000	94.0213165283203
2001	94.1148529052734
2002	94.190803527832
2003	94.2663497924805
2004	94.3439178466797
2005	94.2029266357422
2006	94.2198715209961
2007	94.0609817504883
2008	94.2057876586914
2009	94.1679916381836
2010	94.103401184082
2011	93.9749603271484
2012	93.4559631347656
2013	92.9753036499023
2014	92.735710144043
2015	93.5272216796875
2016	93.2515869140625
2017	93.5616226196289
2018	93.9925994873047
2019	94.3786392211914
2020	93.2508392333984
2021	93.1938400268555