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| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00% |
| 1982 | .01 | 0.00% |
| 1983 | .01 | 0.00% |
| 1984 | .01 | 7.69% |
| 1985 | .01 | 0.00% |
| 1986 | .02 | 21.43% |
| 1987 | .02 | 11.76% |
| 1988 | .02 | 10.53% |
| 1989 | .03 | 38.10% |
| 1990 | .04 | 31.03% |
| 1991 | .04 | 2.63% |
| 1992 | .04 | 5.13% |
| 1993 | .04 | 7.32% |
| 1994 | .04 | 4.55% |
| 1995 | .04 | 2.17% |
| 1996 | .04 | 2.13% |
| 1997 | .05 | 4.17% |
| 1998 | .05 | 0.00% |
| 1999 | .05 | 2.00% |
| 2000 | .05 | 7.84% |
| 2001 | .05 | 1.82% |
| 2002 | .05 | 0.00% |
| 2003 | .05 | 1.79% |
| 2004 | .05 | 3.51% |
| 2005 | .06 | 1.69% |
| 2006 | .06 | 3.33% |
| 2007 | .06 | -3.23% |
| 2008 | .06 | 0.00% |
| 2009 | .06 | 0.00% |
| 2010 | .03 | -50.00% |
| 2011 | .03 | 3.33% |
| 2012 | .03 | 3.23% |
| 2013 | .03 | 0.00% |
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