Year	% of cohort
1971	78.331916809082
1978	81.8512878417969
1979	79.2695770263672
1980	69.7867813110352
1981	59.8608093261719
1982	59.2401084899902
1983	43.5689086914062
1984	53.4029808044434
1985	59.8933982849121
1986	80.7512283325195
1987	70.3791427612305
1988	67.0285797119141
1989	72.891487121582
1990	74.5457611083984
1991	55.3079299926758
1995	79.2831115722656
1999	54.8499183654785
2000	79.407600402832
2002	73.194206237793
2003	79.4598770141602
2004	79.2754135131836
2005	89.0927963256836
2007	79.6811218261719
2009	78.3328094482422
2010	63.1720085144043
2011	76.210693359375
2012	71.4038772583008
2013	61.119571685791
2020	74.9563293457031
2021	79.3812637329102