Year	% of cohort
1972	46.6819610595703
1973	70.285400390625
1974	45.6007804870605
1975	41.9600486755371
1976	41.2235488891602
1977	44.6923789978027
1978	45.8740310668945
1979	49.1384811401367
1980	56.3526382446289
1981	58.3567695617676
1982	53.8243408203125
1983	51.6761512756348
1984	60.9806213378906
1985	55.8015785217285
1986	65.8668670654297
1987	64.202018737793
1988	54.563289642334
1989	60.7784118652344
1990	70.6391296386719
1991	58.3356285095215
1992	52.8574295043945
1993	76.9683380126953
1994	72.9505081176758
1995	57.9194717407227
1996	61.806209564209
1997	70.6864776611328
1998	62.0848083496094
1999	66.6039199829102
2000	62.9006118774414
2001	67.4018630981445
2002	76.7949066162109
2003	64.4805679321289
2004	74.0015106201172
2005	71.234260559082
2006	55.9023513793945
2007	76.6532669067383
2008	72.6874771118164
2009	76.8168029785156
2010	72.7465286254883
2011	75.0746612548828
2012	66.8969116210938
2013	77.6793975830078
2014	73.5002899169922
2015	80.6195907592773
2022	78.8175811767578