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| year | consumption | change |
| 1980 | .97 | NA |
| 1981 | 1.02 | 4.21% |
| 1982 | 1.06 | 4.43% |
| 1983 | 1.12 | 5.75% |
| 1984 | 1.15 | 2.94% |
| 1985 | .99 | -13.86% |
| 1986 | 1.00 | 0.20% |
| 1987 | 1.00 | 0.00% |
| 1988 | 1.16 | 15.96% |
| 1989 | .96 | -17.14% |
| 1990 | 1.20 | 24.97% |
| 1991 | 1.15 | -4.26% |
| 1992 | 1.07 | -6.81% |
| 1993 | 1.00 | -6.56% |
| 1994 | .94 | -5.92% |
| 1995 | .87 | -6.93% |
| 1996 | .74 | -14.89% |
| 1997 | .68 | -9.15% |
| 1998 | .61 | -9.33% |
| 1999 | .66 | 8.01% |
| 2000 | .68 | 3.03% |
| 2001 | .70 | 3.08% |
| 2002 | .67 | -4.42% |
| 2003 | .69 | 2.68% |
| 2004 | .68 | -0.73% |
| 2005 | .70 | 2.05% |
| 2006 | .74 | 6.02% |
| 2007 | .65 | -11.62% |
| 2008 | .72 | 10.24% |
| 2009 | .67 | -6.80% |
| 2010 | .66 | -2.23% |
| 2011 | .50 | -24.35% |
| 2012 | .49 | -1.61% |
| 2013 | .61 | 23.72% |
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