1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2020 - 2021 Change |
2016 - 2021 Change |
Proportional Change |
Peak year - 2021 Change |
Proportional Change |
Low year - 2021 Change |
Proportional Change |
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Lifetime | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | 29.6 | 31.4 | 29.7 | 28.7 | 26.6 | 25.5 | 21.5 | 19.9 | 17.7 | 17.2 | 15.0 | 14.8 | 14.9 | 15.6 | 16.0 | 16.6 | 15.7 | 17.1 | 16.6 | 17.1 | 21.0 | 17.9 | 15.6 | 13.7 | 13.0 | 10.4 | 10.5 | 9.5 | 7.2 | 7.7 | 7.7 | 8.1 | 9.1 | 7.9 | 6.4 | 6.7 | 6.2 | 5.1 | § | 4.6 | | | . *** | | | -1.9 | -29.1 | | | -26.9*** | -85.5 | | | . | 0.0 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | 20.5 | 20.5 | 18.8 | 16.9 | 15.3 | 13.9 | 12.2 | 10.9 | 10.4 | 8.8 | 8.4 | 8.0 | 9.3 | 9.8 | 9.3 | 9.8 | 9.6 | 10.2 | 11.1 | 11.8 | 15.1 | 13.0 | 10.7 | 10.0 | 9.4 | 6.7 | 7.2 | 6.1 | 4.3 | 4.9 | 5.5 | 5.3 | 6.4 | 5.1 | 4.5 | 4.0 | 3.5 | 3.1 | § | 2.5 | | | . *** | | | -2.0** | -44.5 | | | -18.0*** | -87.8 | | | . ** | 0.0 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | 9.8 | 9.5 | 9.9 | 7.3 | 6.5 | 5.8 | 5.1 | 4.8 | 4.3 | 3.7 | 4.0 | 3.8 | 4.2 | 3.8 | 4.3 | 4.6 | 4.8 | 5.4 | 5.8 | 6.3 | 9.2 | 6.5 | 5.6 | 4.4 | 5.3 | 3.8 | 3.7 | 2.6 | 2.1 | 2.4 | 3.4 | 2.4 | 3.6 | 2.1 | 2.1 | 2.4 | 1.9 | 1.9 | § | 1.1 | | | . *** | | | -1.0* | -47.4 | | | -8.8*** | -88.6 | | | . * | 0.0 |