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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00% |
| 1982 | .01 | 25.00% |
| 1983 | .01 | 30.00% |
| 1984 | .01 | 7.69% |
| 1985 | .01 | -35.71% |
| 1986 | .02 | 66.67% |
| 1987 | .02 | 6.67% |
| 1988 | .02 | 0.00% |
| 1989 | .02 | -6.25% |
| 1990 | .02 | 33.33% |
| 1991 | .02 | 15.00% |
| 1992 | .02 | 0.00% |
| 1993 | .02 | 0.00% |
| 1994 | .03 | 17.39% |
| 1995 | .03 | 11.11% |
| 1996 | .03 | 13.33% |
| 1997 | .04 | 5.88% |
| 1998 | .04 | 22.22% |
| 1999 | .06 | 27.27% |
| 2000 | .06 | 3.57% |
| 2001 | .06 | 6.90% |
| 2002 | .06 | -4.84% |
| 2003 | .06 | 3.39% |
| 2004 | .06 | 3.28% |
| 2005 | .07 | 9.52% |
| 2006 | .07 | -1.45% |
| 2007 | .07 | 2.94% |
| 2008 | .07 | 4.29% |
| 2009 | .08 | 8.22% |
| 2010 | .09 | 12.66% |
| 2011 | .09 | -2.25% |
| 2012 | .09 | 2.30% |
| 2013 | .10 | 6.74% |
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