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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 18.7 | 20.6 | 22.5 | 25.7 | 28.5 | 31.2 | 29.4 | 29.0 | 28.3 | 26.8 | 26.8 | 24.5 | 22.8 | 21.5 | 21.4 | 20.9 | 19.0 | 19.6 | 19.9 | 21.4 | 20.1 | 18.5 | 21.1 | 20.3 | 20.5 | 17.2 | 18.2 | 18.7 | 20.4 | 21.3 | 15.9 | | | -5.4* | | | -1.2 | -7.2 | | | -5.4* | -25.2 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 30.6 | 29.8 | 32.8 | 37.4 | 40.9 | 45.4 | 47.3 | 44.9 | 46.2 | 45.6 | 45.6 | 44.6 | 41.4 | 39.8 | 38.2 | 36.1 | 35.6 | 34.1 | 36.0 | 37.0 | 37.7 | 36.8 | 39.1 | 37.4 | 34.7 | 33.7 | 34.3 | 36.3 | 37.5 | 37.3 | 25.0 | | | -12.3*** | | | -8.7*** | -25.8 | | | -14.1*** | -36.1 | | | 0.0 | 0.0 | |
12th Grade | 58.3 | 61.6 | 64.1 | 65.1 | 65.4 | 65.6 | 64.4 | 62.9 | 61.6 | 60.6 | 57.6 | 56.6 | 53.9 | 50.9 | 47.9 | 44.1 | 40.7 | 42.9 | 45.6 | 48.4 | 50.8 | 54.3 | 54.1 | 54.7 | 54.0 | 53.9 | 53.0 | 51.1 | 51.1 | 50.4 | 48.2 | 46.8 | 47.4 | 46.7 | 48.2 | 49.9 | 49.1 | 49.8 | 49.1 | 48.9 | 48.3 | 48.9 | 47.8 | 47.4 | 46.6 | 41.3 | | | -5.3* | | | -7.0*** | -14.5 | | | -8.5*** | -17.1 | | | 0.0 | 0.0 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 11.3 | 12.9 | 15.1 | 18.5 | 21.4 | 23.6 | 22.1 | 21.0 | 20.5 | 19.5 | 19.5 | 17.7 | 16.1 | 15.2 | 15.5 | 14.8 | 13.2 | 14.1 | 14.5 | 16.0 | 14.7 | 13.4 | 15.2 | 14.6 | 14.8 | 12.0 | 12.9 | 13.4 | 14.8 | 15.6 | 10.2 | | | -5.4*** | | | -1.8 | -15.1 | | | -5.4*** | -34.8 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 21.4 | 20.4 | 24.7 | 30.0 | 33.3 | 37.5 | 38.5 | 35.0 | 35.9 | 36.4 | 37.2 | 34.8 | 32.0 | 31.1 | 29.8 | 28.7 | 28.1 | 26.9 | 29.4 | 30.2 | 31.1 | 30.1 | 32.1 | 29.9 | 27.9 | 26.8 | 27.8 | 29.9 | 31.0 | 30.4 | 18.7 | | | -11.7*** | | | -8.1*** | -30.2 | | | -13.4*** | -41.7 | | | 0.0 | 0.0 | |
12th Grade | 48.1 | 51.1 | 53.8 | 54.2 | 53.1 | 52.1 | 49.4 | 47.4 | 45.8 | 46.3 | 44.3 | 41.7 | 38.5 | 35.4 | 32.4 | 29.4 | 27.1 | 31.0 | 35.8 | 39.0 | 40.2 | 42.4 | 41.4 | 42.1 | 40.9 | 41.4 | 41.0 | 39.3 | 38.8 | 38.4 | 36.5 | 35.9 | 36.6 | 36.5 | 38.3 | 40.0 | 39.7 | 40.1 | 38.7 | 38.6 | 38.3 | 39.9 | 38.8 | 38.0 | 36.8 | 32.0 | | | -4.8* | | | -6.3*** | -16.3 | | | -8.1*** | -20.2 | | | 0.0 | 0.0 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 5.7 | 6.8 | 8.4 | 10.9 | 12.4 | 14.6 | 12.9 | 12.1 | 12.2 | 11.9 | 11.7 | 10.4 | 9.7 | 8.4 | 8.5 | 8.1 | 7.4 | 7.6 | 8.1 | 9.5 | 8.5 | 7.7 | 8.7 | 8.3 | 8.1 | 6.9 | 7.0 | 7.3 | 8.5 | 8.7 | 5.9 | | | -2.8* | | | -1.0 | -14.0 | | | -2.8* | -32.2 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 11.6 | 11.0 | 14.0 | 18.5 | 20.2 | 23.2 | 23.0 | 21.5 | 22.1 | 22.5 | 22.7 | 20.8 | 19.5 | 18.3 | 17.3 | 16.8 | 16.9 | 15.8 | 17.8 | 18.5 | 19.2 | 18.6 | 19.2 | 18.5 | 16.5 | 15.9 | 17.2 | 18.3 | 19.8 | 18.2 | 10.9 | | | -7.2*** | | | -5.0*** | -31.3 | | | -8.9*** | -44.8 | | | 0.0 | 0.0 | |
12th Grade | 34.2 | 37.6 | 38.9 | 38.9 | 37.2 | 36.9 | 32.5 | 29.2 | 29.1 | 29.6 | 27.1 | 24.6 | 21.3 | 19.7 | 17.2 | 16.4 | 14.4 | 18.3 | 21.9 | 23.8 | 24.6 | 26.2 | 25.6 | 25.9 | 24.9 | 25.7 | 25.4 | 24.1 | 23.4 | 23.1 | 21.5 | 21.9 | 22.3 | 23.3 | 23.8 | 25.2 | 25.2 | 25.2 | 23.7 | 23.6 | 24.4 | 24.9 | 24.0 | 23.7 | 22.2 | 20.6 | | | -1.6 | | | -3.8** | -15.7 | | | -4.6** | -18.3 | | | 0.0 | 0.0 |