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 |
||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Lifetime | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 26.7 | 26.8 | 26.4 | 25.9 | 25.3 | 26.8 | 25.2 | 24.8 | 24.8 | 25.1 | 23.4 | 21.3 | 20.3 | 19.9 | 19.5 | 19.5 | 17.9 | 18.0 | 17.4 | 16.3 | 14.8 | 12.8 | 12.2 | 10.8 | 10.9 | 8.6 | 9.2 | 9.2 | 10.1 | 10.1 | 8.3 | | | -1.8 | | | -0.3 | -4.0 | | | -18.6*** | -69.2 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 50.0 | 47.7 | 47.9 | 47.2 | 46.9 | 48.5 | 49.4 | 46.7 | 48.9 | 49.3 | 48.2 | 44.0 | 42.4 | 42.3 | 42.1 | 41.4 | 41.2 | 37.2 | 38.6 | 36.9 | 35.9 | 34.6 | 33.5 | 30.2 | 28.6 | 26.0 | 25.1 | 26.2 | 25.5 | 28.8 | 17.8 | | | -10.9*** | | | -8.2*** | -31.5 | | | -32.2*** | -64.3 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 65.4 | 63.4 | 62.5 | 62.9 | 63.2 | 61.8 | 64.2 | 62.4 | 62.3 | 62.3 | 63.9 | 61.6 | 58.1 | 60.3 | 57.5 | 56.4 | 55.1 | 54.7 | 56.5 | 54.1 | 51.0 | 54.2 | 52.3 | 49.8 | 46.7 | 46.3 | 45.3 | 42.9 | 40.8 | 41.7 | 38.9 | | | -2.8 | | | -7.4* | -15.9 | | | -26.6*** | -40.6 | | | 0.0 | 0.0 | |
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 17.5 | 18.3 | 18.2 | 18.2 | 18.4 | 19.8 | 18.4 | 17.9 | 18.5 | 18.5 | 16.6 | 15.0 | 14.5 | 14.5 | 14.1 | 13.9 | 12.6 | 12.7 | 12.2 | 11.5 | 10.5 | 8.6 | 8.4 | 7.3 | 7.7 | 5.7 | 6.4 | 6.5 | 6.6 | 7.5 | 5.7 | | | -1.8 | | | 0.0 | 0.6 | | | -14.1*** | -71.3 | | | 0.0 | 0.6 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 40.1 | 37.0 | 37.8 | 38.0 | 38.5 | 40.1 | 40.7 | 38.3 | 40.9 | 41.6 | 39.9 | 35.4 | 34.7 | 35.1 | 34.2 | 34.5 | 34.4 | 30.0 | 31.2 | 29.9 | 28.8 | 28.2 | 27.1 | 24.6 | 23.4 | 20.5 | 20.4 | 20.9 | 20.2 | 23.1 | 13.4 | | | -9.7*** | | | -7.1*** | -34.5 | | | -28.2*** | -67.8 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 52.7 | 50.3 | 49.6 | 51.7 | 52.5 | 51.9 | 53.2 | 52.0 | 53.2 | 51.8 | 53.2 | 50.4 | 48.0 | 51.8 | 47.7 | 47.9 | 46.1 | 45.6 | 47.0 | 44.0 | 42.2 | 45.0 | 43.5 | 41.4 | 37.7 | 37.3 | 35.6 | 33.9 | 32.8 | 36.9 | 28.8 | | | -8.2* | | | -8.6** | -22.9 | | | -24.4*** | -45.9 | | | 0.0 | 0.0 | |
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 7.6 | 7.5 | 7.8 | 8.7 | 8.3 | 9.6 | 8.2 | 8.4 | 9.4 | 8.3 | 7.7 | 6.7 | 6.7 | 6.2 | 6.0 | 6.2 | 5.5 | 5.4 | 5.4 | 5.0 | 4.4 | 3.6 | 3.5 | 2.7 | 3.1 | 1.8 | 2.2 | 2.1 | 2.6 | 3.4 | 2.0 | | | -1.4* | | | 0.2 | 13.5 | | | -7.6*** | -79.3 | | | 0.2 | 13.5 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 20.5 | 18.1 | 19.8 | 20.3 | 20.8 | 21.3 | 22.4 | 21.1 | 22.5 | 23.5 | 21.9 | 18.3 | 18.2 | 18.5 | 17.6 | 18.8 | 18.1 | 14.4 | 15.5 | 14.7 | 13.7 | 14.5 | 12.8 | 11.2 | 10.3 | 9.0 | 8.9 | 8.4 | 8.8 | 9.3 | 5.4 | | | -3.9*** | | | -3.6*** | -40.2 | | | -18.1*** | -77.0 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 31.6 | 29.9 | 28.9 | 30.8 | 33.2 | 31.3 | 34.2 | 32.9 | 32.9 | 32.3 | 32.7 | 30.3 | 30.9 | 32.5 | 30.2 | 30.0 | 28.7 | 27.6 | 27.4 | 26.8 | 25.0 | 28.1 | 26.0 | 23.5 | 20.6 | 20.4 | 19.1 | 17.5 | 17.5 | 19.8 | 15.5 | | | -4.3 | | | -4.9* | -24.0 | | | -18.7*** | -54.8 | | | 0.0 | 0.0 | |
Daily | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 0.1 | 0.1 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | 0.3 | 0.4 | 0.3 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 | 0.1 | | | -0.1 | | | 0.0 | 116.0 | | | -0.3*** | -82.1 | | | 0.0 | 116.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 0.2 | 0.3 | 0.4 | 0.4 | 0.6 | 0.4 | 0.6 | 0.6 | 0.7 | 0.5 | 0.6 | 0.5 | 0.5 | 0.4 | 0.4 | 0.5 | 0.5 | 0.3 | 0.4 | 0.3 | 0.2 | 0.4 | 0.3 | 0.3 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.3 | 0.1 | | | -0.2 | | | 0.0 | 17.7 | | | -0.5*** | -79.3 | | | 0.0 | 17.7 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 0.9 | 0.8 | 0.9 | 1.2 | 1.3 | 1.6 | 2.0 | 1.5 | 1.9 | 1.7 | 1.4 | 1.2 | 1.6 | 1.8 | 1.5 | 1.6 | 1.3 | 1.4 | 1.1 | 1.6 | 1.3 | 1.5 | 1.3 | 1.1 | 0.8 | 0.8 | 1.1 | 0.7 | 1.1 | 0.8 | 0.4 | | | -0.4 | | | -0.4 | -49.5 | | | -1.6*** | -79.7 | | | 0.0 | 0.0 |