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 | . | . | . | . | . | . | 19.1 | 20.4 | 22.7 | 26.3 | 31.5 | 37.4 | 37.4 | 36.3 | 37.0 | 37.0 | 35.6 | 30.5 | 31.3 | 31.2 | 30.5 | 31.0 | 29.6 | 25.5 | 23.0 | 25.6 | 22.5 | 19.8 | 18.4 | 15.8 | 14.8 | 12.3 | 9.6 | 7.6 | 6.4 | 6.3 | 5.9 | 5.2 | 4.5 | 3.8 | 3.6 | 3.8 | 3.6 | 3.4 | § | 3.4 | | | . | | | -0.2 | -6.0 | | | -34.0*** | -90.9 | | | . | 0.0 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | 11.8 | 12.3 | 13.9 | 18.2 | 22.2 | 25.2 | 26.4 | 23.0 | 23.4 | 22.2 | 20.4 | 19.1 | 20.7 | 20.3 | 19.0 | 19.7 | 19.0 | 15.7 | 15.0 | 17.3 | 14.9 | 12.5 | 11.8 | 10.4 | 10.0 | 7.6 | 6.3 | 4.8 | 3.2 | 3.9 | 3.8 | 3.2 | 3.5 | 2.7 | 2.5 | 2.5 | 2.4 | 1.8 | § | 1.5 | | | . | | | -0.9 | -38.5 | | | -24.9*** | -94.3 | | | . | 0.0 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | 5.5 | 5.3 | 5.8 | 7.2 | 9.6 | 9.2 | 9.8 | 8.5 | 7.3 | 6.8 | 7.2 | 7.0 | 6.3 | 7.3 | 7.5 | 7.8 | 7.4 | 6.8 | 7.3 | 7.2 | 5.8 | 5.0 | 4.5 | 4.2 | 4.2 | 3.3 | 2.6 | 2.3 | 1.6 | 2.2 | 1.9 | 1.5 | 1.7 | 1.2 | 1.7 | 1.6 | 1.2 | 1.1 | § | 0.5 | | | . | | | -1.2** | -71.4 | | | -9.3*** | -95.2 | | | . | 0.0 |