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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 57.8 | 57.7 | 47.2 | 46.7 | 46.5 | 47.6 | 45.8 | 46.5 | 45.2 | 44.8 | 43.4 | 39.5 | 37.5 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 74.1 | 71.4 | 62.1 | 60.7 | 59.5 | 62.6 | 62.2 | 59.7 | 62.0 | 59.6 | 58.5 | 55.6 | 53.6 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | 84.6 | 84.3 | 80.9 | 79.6 | 76.7 | 74.6 | 73.4 | 71.7 | 70.7 | 72.5 | 72.8 | 69.7 | 69.0 | 66.9 | 65.4 | 62.0 | 57.3 | 53.6 | 51.9 | 49.8 | 50.2 | 47.6 | 47.7 | 43.9 | 43.6 | 42.4 | 39.9 | 36.3 | 33.3 | 37.2 | 32.3 | 30.5 | § | 27.2 | | | . | | | -6.1* | -18.4 | | | -57.4*** | -67.9 | | | . | 0.0 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 37.6 | 37.5 | 33.4 | 33.5 | 33.9 | 34.9 | 33.5 | 34.3 | 33.2 | 33.8 | 31.6 | 28.1 | 26.5 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 55.5 | 50.9 | 47.8 | 46.6 | 46.3 | 49.0 | 48.2 | 46.1 | 47.3 | 46.2 | 44.5 | 41.1 | 39.2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | 68.8 | 62.5 | 59.4 | 57.5 | 53.7 | 50.1 | 52.0 | 49.6 | 49.6 | 51.8 | 49.5 | 49.5 | 47.5 | 44.9 | 45.3 | 38.8 | 36.7 | 33.7 | 34.9 | 31.7 | 31.7 | 31.8 | 31.3 | 27.8 | 29.7 | 29.3 | 28.1 | 25.7 | 24.0 | 27.7 | 24.0 | 23.6 | § | 18.4 | | | . | | | -5.6* | -23.3 | | | -50.4*** | -73.3 | | | . | 0.0 | |
Past 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 14.8 | 15.1 | 16.1 | 15.9 | 15.2 | 17.5 | 15.9 | 15.6 | 16.5 | 14.8 | 15.3 | 12.9 | 12.4 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 24.0 | 21.5 | 22.5 | 21.8 | 20.8 | 22.8 | 22.1 | 20.9 | 22.1 | 21.2 | 20.8 | 18.9 | 17.2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | 36.5 | 29.4 | 26.2 | 24.3 | 21.9 | 19.4 | 22.2 | 20.5 | 20.7 | 20.7 | 20.1 | 18.4 | 17.6 | 19.0 | 19.3 | 14.6 | 14.4 | 14.1 | 13.3 | 12.7 | 12.8 | 12.2 | 12.4 | 10.0 | 10.7 | 11.3 | 11.3 | 9.8 | 10.5 | 11.4 | 9.7 | 10.5 | § | 9.1 | | | . | | | -1.4 | -13.3 | | | -27.4*** | -75.1 | | | . | 0.0 | |
Daily | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | | | . | | | . | 0.0 | | | . | 0.0 | | | . | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | 13.9 | 12.4 | 10.5 | 10.2 | 10.4 | 8.5 | 8.9 | 9.0 | 8.4 | 9.4 | 9.5 | 7.7 | 8.8 | 9.7 | 10.0 | 7.1 | 7.5 | 7.2 | 7.1 | 5.8 | 7.3 | 6.2 | 6.4 | 4.9 | 5.4 | 5.3 | 5.8 | 5.0 | 4.3 | 6.3 | 5.0 | 4.9 | § | 4.2 | | | . | | | -0.1 | -2.3 | | | -9.6*** | -69.6 | | | . | 0.0 |