Year	% of cohort
1971	66.5785675048828
1972	63.5655097961426
1973	50.721549987793
1975	59.6416511535645
1976	52.3974914550781
1977	50.1793518066406
1978	54.2021217346191
1980	60.6782989501953
1982	56.2995681762695
1983	33.1706809997559
1984	53.4953308105469
1985	37.8149681091309
1986	45.0699501037598
1987	35.6776885986328
1988	42.0746192932129
1989	8.04368019104004
1991	46.9074211120605
1992	62.8568992614746
1993	48.3491897583008
1994	59.0456390380859
1995	54.8955612182617
1996	60.9955596923828
1997	58.3841705322266
2000	82.2536468505859
2001	71.6587219238281
2002	61.9698905944824
2003	64.8487701416016
2009	56.1278915405273
2010	58.3122901916504
2011	60.4824409484863
2012	54.7155990600586
2013	54.3069686889648
2014	58.6498413085938
2015	48.5324897766113
2018	35.2528114318848
2019	39.8841896057129
2020	54.9436187744141
2021	53.9010696411133