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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 10.2 | 11.2 | 12.6 | 16.7 | 19.9 | 23.1 | 22.6 | 22.2 | 22.0 | 20.3 | 20.4 | 19.2 | 17.5 | 16.3 | 16.5 | 15.7 | 14.2 | 14.6 | 15.7 | 17.3 | 16.4 | 15.2 | 16.5 | 15.6 | 15.5 | 12.8 | 13.5 | 13.9 | 15.2 | 14.8 | 10.2 | | | -4.6** | | | -2.6* | -20.5 | | | -12.9*** | -55.8 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 23.4 | 21.4 | 24.4 | 30.4 | 34.1 | 39.8 | 42.3 | 39.6 | 40.9 | 40.3 | 40.1 | 38.7 | 36.4 | 35.1 | 34.1 | 31.8 | 31.0 | 29.9 | 32.3 | 33.4 | 34.5 | 33.8 | 35.8 | 33.7 | 31.1 | 29.7 | 30.7 | 32.6 | 34.0 | 33.3 | 22.0 | | | -11.3*** | | | -7.7*** | -25.9 | | | -20.3*** | -47.9 | | | 0.0 | 0.0 | |
12th Grade | 52.8 | 56.4 | 59.2 | 60.4 | 60.3 | 59.5 | 58.7 | 57.0 | 54.9 | 54.2 | 50.9 | 50.2 | 47.2 | 43.7 | 40.7 | 36.7 | 32.6 | 35.3 | 38.2 | 41.7 | 44.9 | 49.6 | 49.1 | 49.7 | 48.8 | 49.0 | 47.8 | 46.1 | 45.7 | 44.8 | 42.3 | 41.8 | 42.6 | 42.0 | 43.8 | 45.5 | 45.2 | 45.5 | 44.4 | 44.7 | 44.5 | 45.0 | 43.6 | 43.7 | 43.7 | 38.6 | | | -5.1* | | | -6.0** | -13.4 | | | -21.8*** | -36.1 | | | 5.9*** | 18.2 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6.2 | 7.2 | 9.2 | 13.0 | 15.8 | 18.3 | 17.7 | 16.9 | 16.5 | 15.6 | 15.4 | 14.6 | 12.7 | 11.8 | 12.2 | 11.7 | 10.3 | 10.9 | 11.8 | 13.7 | 12.5 | 11.4 | 12.7 | 11.7 | 11.8 | 9.4 | 10.1 | 10.5 | 11.8 | 11.4 | 7.1 | | | -4.3** | | | -2.3* | -24.1 | | | -11.2*** | -61.2 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 16.5 | 15.2 | 19.2 | 25.2 | 28.7 | 33.6 | 34.8 | 31.1 | 32.1 | 32.2 | 32.7 | 30.3 | 28.2 | 27.5 | 26.6 | 25.2 | 24.6 | 23.9 | 26.7 | 27.5 | 28.8 | 28.0 | 29.8 | 27.3 | 25.4 | 23.9 | 25.5 | 27.5 | 28.8 | 28.0 | 17.3 | | | -10.7*** | | | -6.6*** | -27.5 | | | -17.5*** | -50.3 | | | 0.0 | 0.0 | |
12th Grade | 44.5 | 47.6 | 50.2 | 50.8 | 48.8 | 46.1 | 44.3 | 42.3 | 40.0 | 40.6 | 38.8 | 36.3 | 33.1 | 29.6 | 27.0 | 23.9 | 21.9 | 26.0 | 30.7 | 34.7 | 35.8 | 38.5 | 37.5 | 37.8 | 36.5 | 37.0 | 36.2 | 34.9 | 34.3 | 33.6 | 31.5 | 31.7 | 32.4 | 32.8 | 34.8 | 36.4 | 36.4 | 36.4 | 35.1 | 34.9 | 35.6 | 37.1 | 35.9 | 35.7 | 35.2 | 30.5 | | | -4.7* | | | -5.1** | -14.3 | | | -20.3*** | -39.9 | | | 8.6*** | 39.4 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3.2 | 3.7 | 5.1 | 7.8 | 9.1 | 11.3 | 10.2 | 9.7 | 9.7 | 9.1 | 9.2 | 8.3 | 7.5 | 6.4 | 6.6 | 6.5 | 5.7 | 5.8 | 6.5 | 8.0 | 7.2 | 6.5 | 7.0 | 6.5 | 6.5 | 5.4 | 5.5 | 5.6 | 6.6 | 6.5 | 4.1 | | | -2.4* | | | -1.3* | -24.3 | | | -7.1*** | -63.5 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 8.7 | 8.1 | 10.9 | 15.8 | 17.2 | 20.4 | 20.5 | 18.7 | 19.4 | 19.7 | 19.8 | 17.8 | 17.0 | 15.9 | 15.2 | 14.2 | 14.2 | 13.8 | 15.9 | 16.7 | 17.6 | 17.0 | 18.0 | 16.6 | 14.8 | 14.0 | 15.7 | 16.7 | 18.4 | 16.6 | 10.1 | | | -6.6*** | | | -3.9*** | -28.2 | | | -10.5*** | -51.0 | | | 0.0 | 0.0 | |
12th Grade | 32.2 | 35.4 | 37.1 | 36.5 | 33.7 | 31.6 | 28.5 | 27.0 | 25.2 | 25.7 | 23.4 | 21.0 | 18.0 | 16.7 | 14.0 | 13.8 | 11.9 | 15.5 | 19.0 | 21.2 | 21.9 | 23.7 | 22.8 | 23.1 | 21.6 | 22.4 | 21.5 | 21.2 | 19.9 | 19.8 | 18.3 | 18.8 | 19.4 | 20.6 | 21.4 | 22.6 | 22.9 | 22.7 | 21.2 | 21.3 | 22.5 | 22.9 | 22.2 | 22.3 | 21.1 | 19.5 | | | -1.7 | | | -3.0* | -13.4 | | | -17.6*** | -47.5 | | | 7.5*** | 63.2 | |
Current Daily | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 0.2 | 0.2 | 0.4 | 0.7 | 0.8 | 1.5 | 1.1 | 1.1 | 1.4 | 1.3 | 1.3 | 1.2 | 1.0 | 0.8 | 1.0 | 1.0 | 0.8 | 0.9 | 1.0 | 1.2 | 1.3 | 1.1 | 1.1 | 1.0 | 1.1 | 0.7 | 0.8 | 0.7 | 1.3 | 1.1 | 0.6 | | | -0.4 | | | -0.1 | -10.9 | | | -0.8*** | -56.5 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 0.8 | 0.8 | 1.0 | 2.2 | 2.8 | 3.5 | 3.7 | 3.6 | 3.8 | 3.8 | 4.5 | 3.9 | 3.6 | 3.2 | 3.1 | 2.8 | 2.8 | 2.7 | 2.8 | 3.3 | 3.6 | 3.5 | 4.0 | 3.4 | 3.0 | 2.5 | 2.9 | 3.4 | 4.8 | 4.4 | 3.2 | | | -1.3 | | | 0.6 | 25.2 | | | -1.6* | -33.8 | | | 0.0 | 0.0 | |
12th Grade | 8.2 | 9.1 | 10.7 | 10.3 | 9.1 | 7.0 | 6.3 | 5.5 | 5.0 | 4.9 | 4.0 | 3.3 | 2.7 | 2.9 | 2.2 | 2.0 | 1.9 | 2.4 | 3.6 | 4.6 | 4.9 | 5.8 | 5.6 | 6.0 | 6.0 | 5.8 | 6.0 | 6.0 | 5.6 | 5.0 | 5.0 | 5.1 | 5.4 | 5.2 | 6.1 | 6.6 | 6.5 | 6.5 | 5.8 | 6.0 | 6.0 | 5.9 | 5.8 | 6.4 | 6.9 | 5.8 | | | -1.1 | | | -0.2 | -3.5 | | | -4.9*** | -46.0 | | | 3.9*** | 209.6 | |
Ever Daily | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | 20.5 | 16.8 | 16.3 | 15.6 | 14.9 | 14.7 | 12.8 | 11.5 | 10.0 | 9.0 | 8.4 | 9.6 | 11.3 | 12.1 | 15.7 | 18.8 | 18.0 | 17.9 | 17.0 | 18.0 | 15.5 | 16.4 | 17.8 | 14.5 | 16.6 | 15.7 | 15.1 | 14.9 | 15.5 | 17.4 | 18.2 | 15.8 | 13.7 | 12.4 | 14.3 | 13.9 | 12.3 | 14.9 | § | 12.4 | | | . | | | -1.9 | -13.4 | | | -8.1*** | -39.5 | | | . | 0.0 |