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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 22.2 | 20.7 | 18.7 | 19.9 | 20.0 | 20.4 | 16.8 | 15.0 | 14.4 | 12.8 | 11.7 | 11.2 | 11.3 | 11.0 | 10.1 | 10.2 | 9.1 | 9.8 | 9.6 | 9.9 | 9.7 | 8.1 | 7.9 | 8.0 | 8.6 | 6.9 | 6.2 | 6.4 | 7.1 | 7.8 | 4.6 | | | -3.2* | | | -2.3** | -33.1 | | | -17.6*** | -79.2 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 28.2 | 26.6 | 28.1 | 29.2 | 27.6 | 27.4 | 26.3 | 22.7 | 20.4 | 19.1 | 19.5 | 16.9 | 14.6 | 13.8 | 14.5 | 15.0 | 15.1 | 12.2 | 15.2 | 16.8 | 15.6 | 15.4 | 14.0 | 13.6 | 12.3 | 10.2 | 9.1 | 10.0 | 9.2 | 9.3 | 4.9 | | | -4.3*** | | | -5.2*** | -51.3 | | | -24.2*** | -83.1 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | 31.4 | 32.2 | 30.4 | 29.2 | . | . | 32.4 | 31.0 | 30.7 | 30.9 | 29.8 | 25.3 | 26.2 | 23.4 | 23.1 | 19.7 | 18.3 | 17.0 | 16.7 | 17.5 | 15.2 | 15.1 | 15.6 | 16.3 | 17.6 | 16.9 | 17.4 | 17.2 | 15.1 | 13.2 | 14.2 | 11.0 | 10.1 | 9.8 | § | 8.6 | | | . | | | -5.6* | -39.5 | | | -23.9*** | -73.6 | | | . | 0.0 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6.9 | 7.0 | 6.6 | 7.7 | 7.1 | 7.1 | 5.5 | 4.8 | 4.5 | 4.2 | 4.0 | 3.3 | 4.1 | 4.1 | 3.3 | 3.7 | 3.2 | 3.5 | 3.7 | 4.1 | 3.5 | 2.8 | 2.8 | 3.0 | 3.2 | 2.5 | 1.7 | 2.1 | 2.5 | 2.3 | 1.6 | | | -0.6 | | | -0.9* | -34.4 | | | -6.1*** | -78.7 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 10.0 | 9.6 | 10.4 | 10.5 | 9.7 | 8.6 | 8.9 | 7.5 | 6.5 | 6.1 | 6.9 | 6.1 | 5.3 | 4.9 | 5.6 | 5.7 | 6.1 | 5.0 | 6.5 | 7.5 | 6.6 | 6.4 | 6.4 | 5.3 | 4.9 | 3.5 | 3.8 | 3.9 | 3.2 | 3.5 | 1.7 | | | -1.8** | | | -1.8*** | -52.2 | | | -8.8*** | -84.0 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | 11.5 | 11.3 | 10.3 | 8.4 | . | . | 11.4 | 10.7 | 11.1 | 12.2 | 9.8 | 9.7 | 8.8 | 8.4 | 7.6 | 7.8 | 6.5 | 6.7 | 6.7 | 7.6 | 6.1 | 6.6 | 6.5 | 8.4 | 8.5 | 8.3 | 7.9 | 8.1 | 8.4 | 6.1 | 6.6 | 4.9 | 4.2 | 3.5 | § | 2.2 | | | . | | | -4.4*** | -66.7 | | | -10.0*** | -81.9 | | | . | 0.0 | |
Daily | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1.6 | 1.8 | 1.5 | 1.9 | 1.2 | 1.5 | 1.0 | 1.0 | 0.9 | 0.9 | 1.2 | 0.8 | 0.8 | 1.0 | 0.7 | 0.7 | 0.8 | 0.8 | 0.8 | 0.9 | 0.8 | 0.5 | 0.5 | 0.5 | 0.8 | 0.6 | 0.4 | 0.3 | 0.5 | 0.5 | 0.4 | | | -0.1 | | | -0.2 | -30.7 | | | -1.5** | -77.3 | | | 0.1 | 32.9 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3.3 | 3.0 | 3.3 | 3.0 | 2.7 | 2.2 | 2.2 | 2.2 | 1.5 | 1.9 | 2.2 | 1.7 | 1.8 | 1.6 | 1.9 | 1.7 | 1.6 | 1.4 | 1.9 | 2.5 | 1.7 | 2.0 | 1.9 | 1.8 | 1.6 | 1.0 | 0.6 | 1.0 | 0.9 | 0.7 | 0.4 | | | -0.3 | | | -0.7** | -64.5 | | | -3.0*** | -89.1 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 4.3 | 3.3 | 3.9 | 3.6 | 3.3 | 4.4 | 3.2 | 2.9 | 3.2 | 2.8 | 2.0 | 2.2 | 2.8 | 2.5 | 2.2 | 2.8 | 2.7 | 2.9 | 3.1 | 3.1 | 3.2 | 3.0 | 3.4 | 2.9 | 2.7 | 2.0 | 1.6 | 1.1 | § | 0.7 | | | . | | | -2.0*** | -75.4 | | | -3.7*** | -84.9 | | | . | 0.0 |