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| year | consumption | change |
| 1992 | 14.00 | NA |
| 1993 | 18.00 | 28.57% |
| 1994 | 19.00 | 5.56% |
| 1995 | 22.00 | 15.79% |
| 1996 | 26.00 | 18.18% |
| 1997 | 27.00 | 3.85% |
| 1998 | 26.00 | -3.70% |
| 1999 | 26.00 | 0.00% |
| 2000 | 23.00 | -11.54% |
| 2001 | 26.00 | 13.04% |
| 2002 | 26.00 | 0.00% |
| 2003 | 27.00 | 3.85% |
| 2004 | 29.00 | 7.41% |
| 2005 | 30.00 | 3.45% |
| 2006 | 32.00 | 6.67% |
| 2007 | 32.00 | 0.00% |
| 2008 | 40.00 | 25.00% |
| 2009 | 33.00 | -17.50% |
| 2010 | 35.00 | 6.06% |
| 2011 | 36.00 | 2.86% |
| 2012 | 35.00 | -2.78% |
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