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| year | consumption | change |
| 1980 | .17 | NA |
| 1981 | .17 | -4.02% |
| 1982 | .17 | 0.60% |
| 1983 | .19 | 10.12% |
| 1984 | .25 | 35.68% |
| 1985 | .27 | 9.16% |
| 1986 | .21 | -24.82% |
| 1987 | .19 | -6.80% |
| 1988 | .20 | 3.13% |
| 1989 | .21 | 7.58% |
| 1990 | .23 | 6.10% |
| 1991 | .25 | 11.95% |
| 1992 | .25 | -1.98% |
| 1993 | .27 | 9.68% |
| 1994 | .31 | 14.34% |
| 1995 | .33 | 4.50% |
| 1996 | .36 | 10.46% |
| 1997 | .39 | 8.36% |
| 1998 | .39 | -0.51% |
| 1999 | .40 | 3.10% |
| 2000 | .42 | 5.51% |
| 2001 | .47 | 12.59% |
| 2002 | .50 | 5.49% |
| 2003 | .54 | 7.80% |
| 2004 | .59 | 9.46% |
| 2005 | .67 | 14.07% |
| 2006 | .82 | 21.99% |
| 2007 | .82 | 0.37% |
| 2008 | .90 | 8.98% |
| 2009 | .85 | -5.35% |
| 2010 | .94 | 11.06% |
| 2011 | .93 | -1.27% |
| 2012 | .83 | -11.16% |
| 2013 | .84 | 1.69% |
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