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| year | consumption | change |
| 1990 | 1.00 | NA |
| 1991 | .00 | -100.00% |
| 1992 | 1.40 | NA |
| 1993 | 1.70 | 21.43% |
| 1994 | 1.80 | 5.88% |
| 1995 | 1.80 | 0.00% |
| 1996 | 2.30 | 27.78% |
| 1997 | 2.80 | 21.74% |
| 1998 | 3.50 | 25.00% |
| 1999 | 5.10 | 45.71% |
| 2000 | 5.00 | -1.96% |
| 2001 | 5.60 | 12.00% |
| 2002 | 5.80 | 3.57% |
| 2003 | 6.90 | 18.97% |
| 2004 | 7.30 | 5.80% |
| 2005 | 7.30 | 0.00% |
| 2006 | 8.00 | 9.59% |
| 2007 | 8.40 | 5.00% |
| 2008 | 8.50 | 1.19% |
| 2009 | 9.20 | 8.24% |
| 2010 | 7.00 | -23.91% |
| 2011 | 9.20 | 31.43% |
| 2012 | 9.20 | 0.00% |
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