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| year | consumption | change |
| 1990 | 4.10 | NA |
| 1991 | .00 | -100.00% |
| 1992 | 1.50 | NA |
| 1993 | 1.80 | 20.00% |
| 1994 | 1.70 | -5.56% |
| 1995 | 1.70 | 0.00% |
| 1996 | 1.70 | 0.00% |
| 1997 | 1.70 | 0.00% |
| 1998 | 1.70 | 0.00% |
| 1999 | 7.40 | 335.29% |
| 2000 | 5.50 | -25.68% |
| 2001 | 7.80 | 41.82% |
| 2002 | 8.00 | 2.56% |
| 2003 | 8.30 | 3.75% |
| 2004 | 8.80 | 6.02% |
| 2005 | 8.80 | 0.00% |
| 2006 | 9.50 | 7.95% |
| 2007 | 10.00 | 5.26% |
| 2008 | 10.00 | 0.00% |
| 2009 | 11.00 | 10.00% |
| 2010 | 12.00 | 9.09% |
| 2011 | 11.00 | -8.33% |
| 2012 | 11.00 | 0.00% |
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