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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 17.6 | 17.4 | 19.4 | 19.9 | 21.6 | 21.2 | 21.0 | 20.5 | 19.7 | 17.9 | 17.1 | 15.2 | 15.8 | 17.3 | 17.1 | 16.1 | 15.6 | 15.7 | 14.9 | 14.5 | 13.1 | 11.8 | 10.8 | 10.8 | 9.4 | 7.7 | 8.9 | 8.7 | 9.5 | 12.6 | 11.3 | | | -1.4 | | | 3.6*** | 47.0 | | | -10.4*** | -47.9 | | | 3.6*** | 47.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 15.7 | 16.6 | 17.5 | 18.0 | 19.0 | 19.3 | 18.3 | 18.3 | 17.0 | 16.6 | 15.2 | 13.5 | 12.7 | 12.4 | 13.1 | 13.3 | 13.6 | 12.8 | 12.3 | 12.0 | 10.1 | 9.9 | 8.7 | 8.7 | 7.2 | 6.6 | 6.1 | 6.5 | 6.8 | 7.4 | 7.2 | | | -0.2 | | | 0.6 | 8.9 | | | -12.1*** | -62.6 | | | 1.1* | 18.2 | |
12th Grade | 10.3 | 11.1 | 12.0 | 12.7 | 11.9 | 12.3 | 12.8 | 13.6 | 14.4 | 15.4 | 15.9 | 17.0 | 16.7 | 17.6 | 18.0 | 17.6 | 16.6 | 17.4 | 17.7 | 17.4 | 16.6 | 16.1 | 15.2 | 15.4 | 14.2 | 13.0 | 11.7 | 11.2 | 10.9 | 11.4 | 11.1 | 10.5 | 9.9 | 9.5 | 9.0 | 8.1 | 7.9 | 6.9 | 6.5 | 5.7 | 5.0 | 4.9 | 4.4 | 5.3 | 3.8 | 5.0 | | | 1.2 | | | -0.1 | -1.1 | | | -13.0*** | -72.4 | | | 1.2 | 30.6 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 9.0 | 9.5 | 11.0 | 11.7 | 12.8 | 12.2 | 11.8 | 11.1 | 10.3 | 9.4 | 9.1 | 7.7 | 8.7 | 9.6 | 9.5 | 9.1 | 8.3 | 8.9 | 8.1 | 8.1 | 7.0 | 6.2 | 5.2 | 5.3 | 4.6 | 3.8 | 4.7 | 4.6 | 4.7 | 6.1 | 4.8 | | | -1.3 | | | 1.1 | 28.6 | | | -7.9*** | -62.1 | | | 1.1 | 28.6 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 7.1 | 7.5 | 8.4 | 9.1 | 9.6 | 9.5 | 8.7 | 8.0 | 7.2 | 7.3 | 6.6 | 5.8 | 5.4 | 5.9 | 6.0 | 6.5 | 6.6 | 5.9 | 6.1 | 5.7 | 4.5 | 4.1 | 3.5 | 3.3 | 2.9 | 2.4 | 2.3 | 2.4 | 2.8 | 2.9 | 2.0 | | | -0.8* | | | -0.4 | -17.8 | | | -7.6*** | -79.1 | | | 0.0 | 0.0 | |
12th Grade | 3.0 | 3.7 | 4.1 | 5.4 | 4.6 | 4.1 | 4.5 | 4.3 | 5.1 | 5.7 | 6.1 | 6.9 | 6.5 | 5.9 | 6.9 | 6.6 | 6.2 | 7.0 | 7.7 | 8.0 | 7.6 | 6.7 | 6.2 | 5.6 | 5.9 | 4.5 | 4.5 | 3.9 | 4.2 | 5.0 | 4.5 | 3.7 | 3.8 | 3.4 | 3.6 | 3.2 | 2.9 | 2.5 | 1.9 | 1.9 | 1.7 | 1.5 | 1.6 | 1.9 | 1.1 | 1.8 | | | 0.6 | | | 0.1 | 6.1 | | | -6.2*** | -77.9 | | | 0.6 | 56.8 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 4.4 | 4.7 | 5.4 | 5.6 | 6.1 | 5.8 | 5.6 | 4.8 | 5.0 | 4.5 | 4.0 | 3.8 | 4.1 | 4.5 | 4.2 | 4.1 | 3.9 | 4.1 | 3.8 | 3.6 | 3.2 | 2.7 | 2.3 | 2.2 | 2.0 | 1.8 | 2.1 | 1.8 | 2.1 | 2.9 | 1.8 | | | -1.1 | | | 0.0 | 2.7 | | | -4.3*** | -70.6 | | | 0.1 | 2.9 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2.7 | 2.7 | 3.3 | 3.6 | 3.5 | 3.3 | 3.0 | 2.9 | 2.6 | 2.6 | 2.4 | 2.4 | 2.2 | 2.4 | 2.2 | 2.3 | 2.5 | 2.1 | 2.2 | 2.0 | 1.7 | 1.4 | 1.3 | 1.1 | 1.2 | 1.0 | 1.1 | 1.0 | 1.1 | 1.2 | 0.9 | | | -0.3 | | | -0.1 | -6.9 | | | -2.7*** | -75.3 | | | 0.0 | 0.0 | |
12th Grade | 0.9 | 1.3 | 1.5 | 1.7 | 1.4 | 1.5 | 1.5 | 1.7 | 1.9 | 2.2 | 2.5 | 2.8 | 2.6 | 2.3 | 2.7 | 2.4 | 2.3 | 2.5 | 2.7 | 3.2 | 2.5 | 2.5 | 2.3 | 2.0 | 2.2 | 1.7 | 1.5 | 1.5 | 1.5 | 2.0 | 1.5 | 1.2 | 1.4 | 1.2 | 1.4 | 1.0 | 0.9 | 1.0 | 0.7 | 0.7 | 0.8 | 0.8 | 0.7 | 0.9 | 0.7 | 0.7 | | | 0.0 | | | -0.1 | -12.7 | | | -2.5*** | -78.6 | | | 0.0 | 4.8 |