Year	% of cohort
1971	90.7877807617188
1972	95.5842666625977
1973	88.1699523925781
1974	90.0508117675781
1975	91.3850021362305
1976	89.1667785644531
1977	88.3816604614258
1978	91.5207672119141
1979	87.922607421875
1980	89.9900131225586
1981	92.628532409668
1982	92.8224563598633
1983	94.3171615600586
1984	96.1179504394531
1985	96.6161804199219
1988	94.0984115600586
1989	89.9035491943359
1990	98.3632736206055
1991	94.4208602905273
1992	91.9005432128906
1993	93.5469589233398
1994	90.5389022827148
1995	91.9292602539062
1996	92.8416976928711
1997	85.8604278564453
1999	92.0093307495117
2000	92.1867599487305
2001	92.9334564208984
2020	72.4076614379883
2021	89.9357681274414
2022	89.8626708984375