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year | consumption | change |
1980 | 1.05 | NA |
1981 | .97 | -8.25% |
1982 | 1.10 | 14.17% |
1983 | 1.14 | 3.53% |
1984 | 1.22 | 6.82% |
1985 | 1.33 | 8.93% |
1986 | 1.50 | 12.41% |
1987 | 1.65 | 10.23% |
1988 | 1.70 | 2.97% |
1989 | 1.80 | 5.95% |
1990 | 1.97 | 9.68% |
1991 | 2.06 | 4.61% |
1992 | 2.13 | 3.05% |
1993 | 2.33 | 9.41% |
1994 | 2.23 | -4.17% |
1995 | 2.49 | 11.66% |
1996 | 2.74 | 10.16% |
1997 | 2.92 | 6.46% |
1998 | 2.99 | 2.36% |
1999 | 2.90 | -2.95% |
2000 | 3.16 | 8.79% |
2001 | 2.89 | -8.49% |
2002 | 3.14 | 8.73% |
2003 | 3.31 | 5.32% |
2004 | 3.51 | 6.08% |
2005 | 3.73 | 6.27% |
2006 | 4.07 | 9.12% |
2007 | 4.35 | 6.86% |
2008 | 4.24 | -2.42% |
2009 | 4.24 | 0.00% |
2010 | 4.48 | 5.71% |
2011 | 5.25 | 17.11% |
2012 | 5.40 | 2.88% |
2013 | 5.22 | -3.28% |
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