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| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | 206.12% |
| 1982 | .00 | 27.79% |
| 1983 | .00 | -8.13% |
| 1984 | .00 | -9.28% |
| 1985 | .00 | 30.03% |
| 1986 | .00 | 381.38% |
| 1987 | .01 | 233.33% |
| 1988 | .01 | 20.00% |
| 1989 | .01 | 0.00% |
| 1990 | .01 | 8.33% |
| 1991 | .01 | 0.00% |
| 1992 | .01 | 0.00% |
| 1993 | .01 | 0.00% |
| 1994 | .02 | 15.38% |
| 1995 | .02 | 6.67% |
| 1996 | .02 | 12.50% |
| 1997 | .02 | 0.00% |
| 1998 | .02 | -5.56% |
| 1999 | .02 | 0.00% |
| 2000 | .02 | 0.00% |
| 2001 | .02 | 11.76% |
| 2002 | .02 | 10.53% |
| 2003 | .02 | 4.76% |
| 2004 | .02 | -9.09% |
| 2005 | .02 | 15.00% |
| 2006 | .04 | 52.17% |
| 2007 | .05 | 42.86% |
| 2008 | .05 | 6.00% |
| 2009 | .05 | 1.89% |
| 2010 | .06 | 7.41% |
| 2011 | .06 | -5.17% |
| 2012 | .05 | -5.45% |
| 2013 | .06 | 9.62% |
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