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| year | consumption | change |
| 1980 | .27 | NA |
| 1981 | .29 | 5.47% |
| 1982 | .30 | 2.08% |
| 1983 | .33 | 13.22% |
| 1984 | .37 | 10.18% |
| 1985 | .39 | 4.62% |
| 1986 | .38 | -0.26% |
| 1987 | .44 | 13.28% |
| 1988 | .45 | 4.14% |
| 1989 | .48 | 6.62% |
| 1990 | .56 | 16.56% |
| 1991 | .52 | -7.46% |
| 1992 | .54 | 3.26% |
| 1993 | .60 | 10.59% |
| 1994 | .63 | 6.55% |
| 1995 | .61 | -3.94% |
| 1996 | .65 | 7.06% |
| 1997 | .70 | 6.60% |
| 1998 | .75 | 8.20% |
| 1999 | .77 | 2.93% |
| 2000 | .78 | 1.03% |
| 2001 | .76 | -2.56% |
| 2002 | .82 | 7.61% |
| 2003 | .83 | 0.85% |
| 2004 | .85 | 2.18% |
| 2005 | .81 | -4.73% |
| 2006 | .81 | 0.37% |
| 2007 | .85 | 4.95% |
| 2008 | .98 | 15.21% |
| 2009 | .99 | 0.92% |
| 2010 | 1.02 | 2.94% |
| 2011 | .94 | -7.68% |
| 2012 | .74 | -21.45% |
| 2013 | .88 | 19.57% |
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