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| year | consumption | change |
| 1992 | 7.50 | NA |
| 1993 | 5.20 | -30.67% |
| 1994 | 5.70 | 9.62% |
| 1995 | 5.60 | -1.75% |
| 1996 | 5.50 | -1.79% |
| 1997 | 5.50 | 0.00% |
| 1998 | 6.20 | 12.73% |
| 1999 | 6.40 | 3.23% |
| 2000 | 7.90 | 23.44% |
| 2001 | 8.00 | 1.27% |
| 2002 | 8.30 | 3.75% |
| 2003 | 9.00 | 8.43% |
| 2004 | 10.00 | 11.11% |
| 2005 | 10.00 | 0.00% |
| 2006 | 11.00 | 10.00% |
| 2007 | 12.00 | 9.09% |
| 2008 | 12.00 | 0.00% |
| 2009 | 12.00 | 0.00% |
| 2010 | 17.00 | 41.67% |
| 2011 | 18.00 | 5.88% |
| 2012 | 17.00 | -5.56% |
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