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year | consumption | change |
1980 | .79 | NA |
1981 | .67 | -15.14% |
1982 | .98 | 46.33% |
1983 | 1.07 | 10.04% |
1984 | 1.15 | 6.89% |
1985 | 1.05 | -8.54% |
1986 | 1.07 | 2.29% |
1987 | 1.15 | 6.98% |
1988 | 1.22 | 6.35% |
1989 | 1.18 | -3.44% |
1990 | 1.25 | 5.51% |
1991 | 1.36 | 9.00% |
1992 | 1.30 | -3.98% |
1993 | 1.20 | -7.75% |
1994 | 1.24 | 3.16% |
1995 | 1.29 | 4.11% |
1996 | 1.26 | -2.63% |
1997 | 1.20 | -4.38% |
1998 | 1.25 | 4.24% |
1999 | 1.25 | -0.40% |
2000 | 1.24 | -0.96% |
2001 | 1.25 | 1.46% |
2002 | 1.28 | 1.67% |
2003 | 1.29 | 1.10% |
2004 | 1.25 | -3.03% |
2005 | 1.48 | 18.40% |
2006 | 1.54 | 4.05% |
2007 | 1.61 | 4.48% |
2008 | 1.74 | 7.96% |
2009 | 1.84 | 5.76% |
2010 | 1.86 | 1.20% |
2011 | 2.00 | 7.58% |
2012 | 2.11 | 5.65% |
2013 | 2.13 | 0.62% |
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