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| year | consumption | change |
| 1980 | .38 | NA |
| 1981 | .36 | -3.72% |
| 1982 | .38 | 4.97% |
| 1983 | .37 | -1.58% |
| 1984 | .35 | -7.75% |
| 1985 | .37 | 5.80% |
| 1986 | .39 | 7.95% |
| 1987 | .43 | 9.64% |
| 1988 | .45 | 4.40% |
| 1989 | .47 | 3.99% |
| 1990 | .48 | 2.99% |
| 1991 | .49 | 2.28% |
| 1992 | .50 | 0.81% |
| 1993 | .61 | 21.69% |
| 1994 | .64 | 6.11% |
| 1995 | .66 | 2.95% |
| 1996 | .68 | 2.57% |
| 1997 | .70 | 3.68% |
| 1998 | .72 | 1.70% |
| 1999 | .72 | 0.98% |
| 2000 | .81 | 11.89% |
| 2001 | .78 | -3.34% |
| 2002 | .85 | 8.18% |
| 2003 | .86 | 1.30% |
| 2004 | .88 | 2.68% |
| 2005 | .81 | -8.52% |
| 2006 | .88 | 9.07% |
| 2007 | .90 | 1.94% |
| 2008 | .89 | -0.45% |
| 2009 | .86 | -3.03% |
| 2010 | .96 | 10.53% |
| 2011 | .92 | -4.19% |
| 2012 | .96 | 4.59% |
| 2013 | .93 | -3.03% |
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