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| year | consumption | change |
| 1992 | 24.00 | NA |
| 1993 | 30.00 | 25.00% |
| 1994 | 29.00 | -3.33% |
| 1995 | 35.00 | 20.69% |
| 1996 | 45.00 | 28.57% |
| 1997 | 32.00 | -28.89% |
| 1998 | 34.00 | 6.25% |
| 1999 | 35.00 | 2.94% |
| 2000 | 36.00 | 2.86% |
| 2001 | 37.00 | 2.78% |
| 2002 | 34.00 | -8.11% |
| 2003 | 36.00 | 5.88% |
| 2004 | 38.00 | 5.56% |
| 2005 | 40.00 | 5.26% |
| 2006 | 39.00 | -2.50% |
| 2007 | 40.00 | 2.56% |
| 2008 | 38.00 | -5.00% |
| 2009 | 36.00 | -5.26% |
| 2010 | 37.00 | 2.78% |
| 2011 | 32.00 | -13.51% |
| 2012 | 31.00 | -3.13% |
| 2013 | 30.00 | -3.23% |
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