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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 44.0 | 45.2 | 45.3 | 46.1 | 46.4 | 49.2 | 47.3 | 45.7 | 44.1 | 40.5 | 36.6 | 31.4 | 28.4 | 27.9 | 25.9 | 24.6 | 22.1 | 20.5 | 20.1 | 20.0 | 18.4 | 15.5 | 14.8 | 13.5 | 13.3 | 9.8 | 9.4 | 9.1 | 10.0 | 11.5 | 7.0 | | | -4.5** | | | -2.8** | -28.3 | | | -42.2*** | -85.7 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 55.1 | 53.5 | 56.3 | 56.9 | 57.6 | 61.2 | 60.2 | 57.7 | 57.6 | 55.1 | 52.8 | 47.4 | 43.0 | 40.7 | 38.9 | 36.1 | 34.6 | 31.7 | 32.7 | 33.0 | 30.4 | 27.7 | 25.7 | 22.6 | 19.9 | 17.5 | 15.9 | 16.0 | 14.2 | 13.9 | 10.0 | | | -3.9*** | | | -7.5*** | -42.8 | | | -51.2*** | -83.6 | | | 0.0 | 0.0 | |
12th Grade | 75.4 | 75.7 | 75.3 | 74.0 | 71.0 | 71.0 | 70.1 | 70.6 | 69.7 | 68.8 | 67.6 | 67.2 | 66.4 | 65.7 | 64.4 | 63.1 | 61.8 | 61.9 | 62.0 | 64.2 | 63.5 | 65.4 | 65.3 | 64.6 | 62.5 | 61.0 | 57.2 | 53.7 | 52.8 | 50.0 | 47.1 | 46.2 | 44.7 | 43.6 | 42.2 | 40.0 | 39.5 | 38.1 | 34.4 | 31.1 | 28.3 | 26.6 | 23.8 | 22.2 | 24.0 | 17.8 | | | -6.1 | | | -10.5*** | -37.0 | | | -57.9*** | -76.5 | | | 0.0 | 0.0 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 14.3 | 15.5 | 16.7 | 18.6 | 19.1 | 21.0 | 19.4 | 19.1 | 17.5 | 14.6 | 12.2 | 10.7 | 10.2 | 9.2 | 9.3 | 8.7 | 7.1 | 6.8 | 6.5 | 7.1 | 6.1 | 4.9 | 4.5 | 4.0 | 3.6 | 2.6 | 1.9 | 2.2 | 2.3 | 2.2 | 1.1 | | | -1.0* | | | -1.5*** | -57.1 | | | -19.8*** | -94.6 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 20.8 | 21.5 | 24.7 | 25.4 | 27.9 | 30.4 | 29.8 | 27.6 | 25.7 | 23.9 | 21.3 | 17.7 | 16.6 | 16.0 | 14.9 | 14.5 | 14.0 | 12.3 | 13.1 | 13.6 | 11.8 | 10.8 | 9.1 | 7.2 | 6.3 | 4.9 | 5.0 | 4.2 | 3.4 | 3.2 | 1.8 | | | -1.4** | | | -3.0*** | -62.5 | | | -28.6*** | -94.0 | | | 0.0 | 0.0 | |
12th Grade | 38.8 | 38.4 | 36.7 | 34.4 | 30.5 | 29.4 | 30.0 | 30.3 | 29.3 | 30.1 | 29.6 | 29.4 | 28.7 | 28.6 | 29.4 | 28.3 | 27.8 | 29.9 | 31.2 | 33.5 | 34.0 | 36.5 | 35.1 | 34.6 | 31.4 | 29.5 | 26.7 | 24.4 | 25.0 | 23.2 | 21.6 | 21.6 | 20.4 | 20.1 | 19.2 | 18.7 | 17.1 | 16.3 | 13.6 | 11.4 | 10.5 | 9.7 | 7.6 | 5.7 | 7.5 | 4.1 | | | -3.4 | | | -6.4*** | -60.9 | | | -34.7*** | -89.4 | | | 0.0 | 0.0 | |
Daily | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 7.2 | 7.0 | 8.3 | 8.8 | 9.3 | 10.4 | 9.0 | 8.8 | 8.1 | 7.4 | 5.5 | 5.1 | 4.5 | 4.4 | 4.0 | 4.0 | 3.0 | 3.1 | 2.7 | 2.9 | 2.4 | 1.9 | 1.8 | 1.4 | 1.3 | 0.9 | 0.6 | 0.8 | 0.8 | 0.8 | 0.4 | | | -0.4 | | | -0.5** | -58.9 | | | -10.0*** | -96.3 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 12.6 | 12.3 | 14.2 | 14.6 | 16.3 | 18.3 | 18.0 | 15.8 | 15.9 | 14.0 | 12.2 | 10.1 | 8.9 | 8.3 | 7.5 | 7.6 | 7.2 | 5.9 | 6.3 | 6.6 | 5.5 | 5.0 | 4.4 | 3.2 | 3.0 | 1.9 | 2.2 | 1.8 | 1.3 | 1.2 | 0.8 | | | -0.4 | | | -1.1*** | -59.9 | | | -17.6*** | -95.9 | | | 0.0 | 0.0 | |
12th Grade | 28.8 | 28.8 | 27.5 | 25.4 | 21.3 | 20.3 | 21.1 | 21.2 | 18.7 | 19.5 | 18.7 | 18.7 | 18.1 | 18.9 | 19.1 | 18.5 | 17.2 | 19.0 | 19.4 | 21.6 | 22.2 | 24.6 | 22.4 | 23.1 | 20.6 | 19.0 | 16.9 | 15.8 | 15.6 | 13.6 | 12.2 | 12.3 | 11.4 | 11.2 | 10.7 | 10.3 | 9.3 | 8.5 | 6.7 | 5.5 | 4.8 | 4.2 | 3.6 | 2.4 | 3.1 | 2.0 | | | -1.1 | | | -2.8*** | -57.9 | | | -26.8*** | -93.0 | | | 0.0 | 0.0 | |
1/2 Pack+/Day | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3.1 | 2.9 | 3.5 | 3.6 | 3.4 | 4.3 | 3.5 | 3.6 | 3.3 | 2.8 | 2.3 | 2.1 | 1.8 | 1.7 | 1.7 | 1.5 | 1.1 | 1.2 | 1.0 | 0.9 | 0.7 | 0.6 | 0.7 | 0.5 | 0.4 | 0.3 | 0.2 | 0.3 | 0.2 | 0.1 | 0.2 | | | 0.1 | | | -0.2* | -51.3 | | | -4.1*** | -96.4 | | | 0.1 | 151.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6.5 | 6.0 | 7.0 | 7.6 | 8.3 | 9.4 | 8.6 | 7.9 | 7.6 | 6.2 | 5.5 | 4.4 | 4.1 | 3.3 | 3.1 | 3.3 | 2.7 | 2.0 | 2.4 | 2.4 | 1.9 | 1.5 | 1.5 | 1.2 | 1.0 | 0.6 | 0.7 | 0.7 | 0.5 | 0.6 | 0.3 | | | -0.2 | | | -0.3** | -46.2 | | | -9.1*** | -96.4 | | | 0.0 | 0.0 | |
12th Grade | 19.2 | 19.4 | 18.8 | 16.5 | 14.3 | 13.5 | 14.2 | 13.8 | 12.3 | 12.5 | 11.4 | 11.4 | 10.6 | 11.2 | 11.3 | 10.7 | 10.0 | 10.9 | 11.2 | 12.4 | 13.0 | 14.3 | 12.6 | 13.2 | 11.3 | 10.3 | 9.1 | 8.4 | 8.0 | 6.9 | 5.9 | 5.7 | 5.4 | 5.0 | 4.7 | 4.3 | 4.0 | 3.4 | 2.6 | 2.1 | 1.8 | 1.7 | 1.5 | 0.9 | 1.4 | 0.8 | | | -0.6 | | | -1.0** | -54.2 | | | -18.6*** | -95.8 | | | 0.0 | 0.0 |