Year	% of cohort
1972	50.1024894714355
1973	49.9106216430664
1974	47.0957298278809
1975	53.9804496765137
1976	54.0859107971191
1977	56.3328590393066
1980	58.2030601501465
1981	57.7626113891602
1982	60.2364807128906
1983	60.8391494750977
1984	61.6664810180664
1985	59.4658813476562
1986	61.4244804382324
1987	64.982063293457
1988	66.8977127075195
1989	67.375617980957
1990	71.8734893798828
1991	74.8185577392578
1992	77.7216796875
1993	72.9067687988281
1994	74.8258666992188
1995	79.5065994262695
1997	80.3228607177734
1998	79.0424118041992
1999	80.2306976318359
2002	82.9437026977539
2003	83.2637329101562
2004	89.7248992919922
2005	82.4464874267578
2006	84.4131393432617
2007	85.0068130493164
2008	83.808723449707
2009	86.5334701538086
2010	86.169921875
2011	88.1571502685547
2021	98.7620391845703