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| year | consumption | change |
| 1992 | 44.00 | NA |
| 1993 | 25.00 | -43.18% |
| 1994 | 18.00 | -28.00% |
| 1995 | 25.00 | 38.89% |
| 1996 | 28.00 | 12.00% |
| 1997 | 31.00 | 10.71% |
| 1998 | 32.00 | 3.23% |
| 1999 | 33.00 | 3.13% |
| 2000 | 35.00 | 6.06% |
| 2001 | 37.00 | 5.71% |
| 2002 | 39.00 | 5.41% |
| 2003 | 40.00 | 2.56% |
| 2004 | 41.00 | 2.50% |
| 2005 | 44.00 | 7.32% |
| 2006 | 45.00 | 2.27% |
| 2007 | 47.00 | 4.44% |
| 2008 | 47.00 | 0.00% |
| 2009 | 46.00 | -2.13% |
| 2010 | 9.00 | -80.43% |
| 2011 | 8.50 | -5.56% |
| 2012 | 8.70 | 2.35% |
| 2013 | 8.70 | 0.00% |
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