Year	% of cohort
1973	51.2015914916992
1974	56.1705207824707
1975	42.4700393676758
1976	39.6839904785156
1977	42.4718589782715
1978	44.9574317932129
1979	51.4140586853027
1980	40.5562705993652
1981	47.5269012451172
1982	32.7086982727051
1983	36.2479591369629
1984	50.3943099975586
1985	46.0822410583496
1986	59.630298614502
1987	46.0104598999023
1988	65.4934692382812
1989	56.5550804138184
1990	48.2202491760254
1991	71.333381652832
1992	37.5184898376465
1993	38.7631683349609
1995	35.9662017822266
1999	54.7796401977539
2001	49.7288398742676
2004	43.8493194580078
2005	44.4762115478516
2006	44.5453681945801
2007	70.7338104248047
2008	51.2896118164062
2009	59.5003700256348
2010	58.3022804260254
2011	58.6077117919922
2012	72.9371871948242
2013	63.9056205749512
2018	69.8029937744141