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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | -15.79% |
| 1982 | .02 | -6.25% |
| 1983 | .02 | 26.67% |
| 1984 | .02 | 0.00% |
| 1985 | .02 | 10.53% |
| 1986 | .02 | -28.57% |
| 1987 | .02 | 40.00% |
| 1988 | .02 | 9.52% |
| 1989 | .02 | -26.09% |
| 1990 | .02 | 0.00% |
| 1991 | .02 | 0.00% |
| 1992 | .02 | 11.76% |
| 1993 | .02 | 0.00% |
| 1994 | .02 | 10.53% |
| 1995 | .02 | 4.76% |
| 1996 | .02 | 0.00% |
| 1997 | .02 | 4.55% |
| 1998 | .02 | 0.00% |
| 1999 | .02 | 0.00% |
| 2000 | .03 | 34.78% |
| 2001 | .03 | 6.45% |
| 2002 | .04 | 15.15% |
| 2003 | .04 | 2.63% |
| 2004 | .04 | 10.26% |
| 2005 | .04 | -2.33% |
| 2006 | .04 | -2.38% |
| 2007 | .04 | 2.44% |
| 2008 | .04 | -14.29% |
| 2009 | .03 | -8.33% |
| 2010 | .03 | 0.00% |
| 2011 | .03 | -3.03% |
| 2012 | .04 | 18.75% |
| 2013 | .06 | 44.74% |
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