Year	% of cohort
1960	57.573293
1961	57.724409
1962	57.12234
1963	58.055155
1964	59.245147
1965	58.145043
1966	57.920335
1967	57.292222
1968	56.75108
1969	55.388161
1970	55.635114
1971	55.542252
1972	55.597068
1973	55.708344
1974	55.439005
1975	54.263164
1976	53.667128
1977	53.263613
1978	52.827015
1979	51.814074
1980	51.45919
1981	51.990248
1982	52.793211
1983	52.295673
1984	51.192241
1985	52.946212
1986	57.483934
1987	57.359144
1988	56.800544
1989	56.035793
1990	54.787965
1991	54.103995
1992	51.25147
1993	44.31405
1994	41.001747
1995	41.493079
1996	45.014694
1997	47.851744
1998	48.782835
1999	45.266003
2000	43.586526
2001	43.522721
2002	42.433187
2003	42.265147
2004	43.528474
2005	43.669476
2006	47.006687
2007	49.334238
2008	49.804855
2009	51.595935
2010	51.988721
2011	54.246817
2012	55.538146
2013	56.774378
2014	57.517464
2015	59.171433
2016	60.792585
2017	63.004934
2018	63.566095
2019	64.816353
2020	59.477717
2021	53.849123
2022	55.001426