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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 37.9 | 35.5 | 35.5 | 34.0 | 32.8 | 29.4 | 30.0 | 27.0 | 23.5 | 21.9 | 19.2 | 19.3 | 16.3 | 16.0 | 18.0 | 15.1 | 18.3 | 13.8 | | | -4.5 | | | -2.5 | -15.4 | | | -24.1*** | -63.6 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 58.6 | 58.8 | 58.1 | 55.7 | 53.5 | 51.4 | 51.3 | 48.4 | 46.7 | 44.9 | 42.3 | 38.7 | 33.3 | 34.8 | 35.9 | 33.2 | 36.4 | 24.9 | | | -11.5** | | | -8.4*** | -25.2 | | | -33.9*** | -57.7 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 71.0 | 73.6 | 69.9 | 68.4 | 65.5 | 67.4 | 62.6 | 62.4 | 60.5 | 58.9 | 57.5 | 55.6 | 53.6 | 51.2 | 50.4 | 44.7 | § | 43.7 | | | . *** | | | -9.9* | -18.5 | | | -29.9*** | -40.6 | | | . | ||
Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 30.4 | 27.9 | 26.8 | 26.0 | 25.0 | 22.2 | 21.9 | 19.2 | 17.0 | 15.7 | 13.4 | 13.4 | 11.2 | 10.8 | 12.1 | 10.7 | 14.7 | 10.2 | | | -4.5* | | | -1.0 | -8.6 | | | -20.2*** | -66.3 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 49.7 | 48.5 | 48.8 | 45.9 | 43.4 | 41.5 | 41.0 | 38.3 | 37.8 | 35.6 | 33.2 | 31.4 | 26.1 | 28.3 | 28.8 | 26.8 | 29.6 | 18.8 | | | -10.9** | | | -7.3*** | -28.0 | | | -31.0*** | -62.3 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 55.2 | 55.8 | 58.4 | 54.7 | 53.6 | 51.8 | 53.4 | 47.9 | 47.0 | 44.4 | 44.2 | 43.6 | 42.8 | 40.0 | 39.6 | 38.4 | 37.5 | § | 32.1 | | | . *** | | | -7.8* | -19.6 | | | -26.2*** | -44.9 | | | . | ||
Last 30 Days | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 14.6 | 12.9 | 13.1 | 12.2 | 10.2 | 9.5 | 9.4 | 8.6 | 7.6 | 6.3 | 5.7 | 5.5 | 4.0 | 4.4 | 4.9 | 4.5 | 6.6 | 4.6 | | | -2.0 | | | 0.6 | 15.9 | | | -10.0*** | -68.5 | | | 0.6 | 15.9 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 25.1 | 23.1 | 24.7 | 21.8 | 20.2 | 19.0 | 19.4 | 15.8 | 16.3 | 15.5 | 14.0 | 12.8 | 11.0 | 12.9 | 11.8 | 11.1 | 12.5 | 7.8 | | | -4.7* | | | -3.2** | -29.3 | | | -17.4*** | -69.0 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 31.1 | 30.5 | 29.3 | 29.1 | 27.4 | 27.4 | 24.1 | 23.1 | 21.8 | 21.0 | 19.9 | 20.8 | 18.3 | 20.2 | 18.1 | 18.5 | § | 15.3 | | | . *** | | | -3.0 | -16.5 | | | -15.8*** | -50.8 | | | . |