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| year | consumption | change |
| 1992 | 18.00 | NA |
| 1993 | 19.00 | 5.56% |
| 1994 | 21.00 | 10.53% |
| 1995 | 29.00 | 38.10% |
| 1996 | 24.00 | -17.24% |
| 1997 | 25.00 | 4.17% |
| 1998 | 25.00 | 0.00% |
| 1999 | 27.00 | 8.00% |
| 2000 | 28.00 | 3.70% |
| 2001 | 29.00 | 3.57% |
| 2002 | 32.00 | 10.34% |
| 2003 | 32.00 | 0.00% |
| 2004 | 35.00 | 9.38% |
| 2005 | 35.00 | 0.00% |
| 2006 | 37.00 | 5.71% |
| 2007 | 38.00 | 2.70% |
| 2008 | 38.00 | 0.00% |
| 2009 | 37.00 | -2.63% |
| 2010 | 35.00 | -5.41% |
| 2011 | 34.00 | -2.86% |
| 2012 | 32.00 | -5.88% |
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