Year	% of cohort
1970	50.4904289245605
1978	86.1458511352539
1980	76.1189422607422
1983	89.641242980957
1984	90.6783599853516
1991	81.7214736938477
1992	85.863037109375
1993	88.2306594848633
1994	84.7961807250977
1995	91.0490188598633
1998	86.8567276000977
1999	85.5460433959961
2000	88.0519866943359
2001	86.1517868041992
2002	87.5480499267578
2003	87.5813522338867
2004	87.9032669067383
2005	88.8639297485352
2008	94.6768264770508
2012	95.3852233886719