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| year | consumption | change |
| 1992 | 1.40 | NA |
| 1993 | 1.20 | -14.29% |
| 1994 | 1.20 | 0.00% |
| 1995 | 1.10 | -8.33% |
| 1996 | 1.20 | 9.09% |
| 1997 | 2.40 | 100.00% |
| 1998 | 2.40 | 0.00% |
| 1999 | 2.70 | 12.50% |
| 2000 | 2.90 | 7.41% |
| 2001 | 2.80 | -3.45% |
| 2002 | 2.70 | -3.57% |
| 2003 | 2.80 | 3.70% |
| 2004 | 2.60 | -7.14% |
| 2005 | 2.80 | 7.69% |
| 2006 | 2.60 | -7.14% |
| 2007 | 2.70 | 3.85% |
| 2008 | 2.70 | 0.00% |
| 2009 | 2.50 | -7.41% |
| 2010 | 2.70 | 8.00% |
| 2011 | 2.50 | -7.41% |
| 2012 | 2.70 | 8.00% |
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