Year	% of cohort
1960	80.915318
1961	80.720726
1962	80.786892
1963	80.73239
1964	81.517675
1965	81.589697
1966	81.612537
1967	82.194327
1968	81.849288
1969	81.596417
1970	81.954012
1971	82.295965
1972	81.991479
1973	82.374841
1974	82.432251
1975	82.736599
1976	82.726164
1977	83.226576
1978	83.040119
1979	83.181062
1980	83.691283
1981	84.16112
1982	84.268895
1983	84.615604
1984	84.849259
1985	84.896667
1986	85.380125
1987	85.497981
1988	85.747029
1989	85.997539
1990	86.357642
1991	86.824093
1992	87.225037
1993	87.226749
1994	87.752491
1995	87.80516
1996	88.084836
1997	88.302608
1998	88.48375
1999	88.575828
2000	88.874827
2001	89.099059
2002	89.304086
2003	89.330134
2004	89.780492
2005	89.916116
2006	90.013318
2007	90.170912
2008	90.215967
2009	90.555812
2010	90.711675
2011	90.986844
2012	91.146196
2013	91.249199
2014	91.272054
2015	91.251009
2016	91.096972
2017	91.369751
2018	91.210897
2019	91.49701
2020	90.626618
2021	90.387879
2022	92.047562