Year	% of cohort
1971	60.3605918884277
1972	60.6575508117676
1973	62.4377288818359
1974	63.0959091186523
1975	62.7270584106445
1976	63.5855484008789
1977	64.4814987182617
1978	63.9843711853027
1979	64.1831207275391
1980	63.9971389770508
1981	63.9024887084961
1982	65.1301116943359
1983	64.5583267211914
1984	64.5117263793945
1985	64.7751693725586
1986	64.8957824707031
1987	64.2652969360352
1988	64.277702331543
1989	64.3406524658203
1990	64.9469223022461
1991	64.2647476196289
1992	65.3249893188477
1993	64.3615493774414
1994	63.0601387023926
1995	63.177059173584
1996	61.3612289428711
1997	61.5469207763672
1998	61.9159507751465
1999	61.3532485961914
2000	63.1450691223145
2001	64.3140335083008
2002	62.3186492919922
2003	60.2769317626953
2004	61.152099609375
2005	62.5004005432129
2006	57.7710304260254
2007	56.600269317627
2008	60.4772109985352
2009	56.573600769043
2010	55.697078704834
2011	58.0461883544922
2012	56.8110504150391
2013	57.5871887207031
2014	58.5055809020996
2015	59.5194511413574
2016	59.2001304626465
2017	59.7533111572266
2018	61.0787506103516
2019	61.3985710144043
2020	62.2366104125977