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 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 13.7 | 15.8 | 13.4 | 13.1 | 12.8 | 12.8 | 12.4 | 11.6 | 11.5 | 11.2 | 11.4 | 12.0 | 10.9 | 11.0 | 9.8 | 7.3 | 11.5 | | | 4.3** | | | -0.5 | -4.1 | | | -4.3*** | -27.0 | | | 4.3** | 59.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 14.3 | 14.1 | 12.9 | 12.8 | 13.0 | 12.7 | 12.0 | 12.0 | 11.7 | 11.3 | 13.1 | 11.5 | 10.1 | 12.1 | 9.8 | 9.3 | 9.0 | | | -0.3 | | | -2.4* | -21.1 | | | -5.3*** | -36.8 | | | 0.0 | 0.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 12.3 | 11.7 | 12.1 | 12.5 | 11.8 | 12.7 | 12.2 | 12.7 | 13.1 | 12.6 | 13.7 | 12.7 | 13.0 | 12.7 | 11.1 | 9.9 | 10.9 | | | 1.0 | | | -1.7 | -13.7 | | | -2.8* | -20.5 | | | 1.0 | 10.6 | |
30-Day | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6.1 | 5.2 | 4.5 | 5.1 | 4.9 | 4.7 | 4.9 | 4.7 | 5.0 | 4.6 | 4.9 | 5.6 | 4.7 | 5.2 | 3.8 | 2.7 | 5.5 | | | 2.8** | | | -0.1 | -1.3 | | | -0.6 | -9.2 | | | 2.8** | 106.2 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 5.6 | 4.8 | 4.2 | 4.5 | 5.0 | 4.6 | 4.2 | 5.1 | 5.0 | 4.8 | 5.8 | 4.3 | 4.0 | 5.1 | 4.4 | 4.0 | 4.8 | | | 0.8 | | | 0.5 | 11.5 | | | -1.0 | -16.8 | | | 0.8 | 20.0 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 4.6 | 3.7 | 4.1 | 4.5 | 4.2 | 5.2 | 5.1 | 5.5 | 6.0 | 5.5 | 5.3 | 5.6 | 5.7 | 5.9 | 5.0 | 4.2 | 5.2 | | | 1.0 | | | -0.4 | -7.2 | | | -0.8 | -13.4 | | | 1.0 | 22.4 |