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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Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 12.3 | 11.2 | 9.4 | | | -1.8 | | | . | 0.0 | | | -2.9* | -23.9 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 24.0 | 18.8 | 15.7 | | | -3.2 | | | . | 0.0 | | | -8.3*** | -34.8 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 25.6 | 32.5 | 33.6 | § | 24.6 | | | -3.6 | | | . | 0.0 | | | -9.0** | -26.9 | | | 0.0 | 0.0 |