Year	% of cohort
1970	29.8000793457031
1971	23.0486507415771
1972	28.245059967041
1973	23.3656997680664
1976	28.7261791229248
1977	26.000509262085
1978	22.3220596313477
1979	37.6925392150879
1982	36.512809753418
1983	22.4671192169189
1984	33.6207389831543
1985	19.6495094299316
1986	34.9060287475586
1987	35.5423583984375
1988	28.9321308135986
1989	40.900318145752
1990	43.8697319030762
1991	40.2114105224609
1992	51.2128410339355
1993	52.7344207763672
1994	40.5702514648438
1999	45.9091300964355
2000	51.8096199035645
2001	63.8804817199707
2002	51.7612686157227
2003	54.8619918823242
2004	50.8025512695312
2005	50.2042808532715
2006	43.8540115356445
2007	48.4092712402344