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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Last 12 Months | 8th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 4.2 | 4.0 | 3.6 | 3.8 | 3.2 | 2.7 | 3.0 | 2.9 | 2.0 | 1.6 | 2.6 | 2.1 | 2.8 | 3.2 | 4.6 | 3.5 | | | -1.1 | | | 0.9 | 33.7 | | | -1.1 | -24.1 | | | 0.0 | 0.0 |
10th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 5.3 | 5.4 | 5.3 | 6.0 | 5.1 | 5.5 | 4.7 | 4.3 | 3.7 | 3.3 | 3.0 | 3.6 | 3.3 | 2.6 | 3.3 | 2.7 | | | -0.6 | | | -0.3 | -9.8 | | | -3.3*** | -55.3 | | | 0.1 | 2.7 | |
12th Grade | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6.9 | 5.8 | 5.5 | 5.9 | 6.6 | 5.3 | 5.6 | 5.0 | 4.1 | 4.6 | 4.0 | 3.2 | 3.4 | 2.5 | 3.2 | 1.7 | | | -1.5 | | | -2.3*** | -57.6 | | | -5.1*** | -75.0 | | | 0.0 | 0.0 |