Year	% of cohort
1971	54.1917686462402
1972	54.5031089782715
1973	51.1960601806641
1974	56.6819305419922
1975	62.3238983154297
1976	68.3638687133789
1977	74.6601333618164
1989	69.0449523925781
1990	82.7883605957031
1991	56.0998687744141
1992	59.1653099060059
1995	41.5251502990723
1996	66.2642822265625
1997	63.6382102966309
1998	57.5186080932617
1999	55.6504096984863
2000	70.4179992675781
2001	66.57177734375
2002	66.8381729125977
2003	70.1377563476562
2006	72.0233917236328
2007	72.8584594726562
2008	69.3623275756836
2009	62.7344093322754
2010	71.3941802978516
2012	61.7681999206543
2013	63.3902702331543
2021	58.7096099853516