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| year | consumption | change |
| 1993 | 1.20 | NA |
| 1994 | 1.20 | 0.00% |
| 1995 | 1.10 | -8.33% |
| 1996 | 1.00 | -9.09% |
| 1997 | 1.10 | 10.00% |
| 1998 | 1.00 | -9.09% |
| 1999 | 1.00 | 0.00% |
| 2000 | 1.00 | 0.00% |
| 2001 | 6.40 | 540.00% |
| 2002 | 6.70 | 4.69% |
| 2003 | 6.90 | 2.99% |
| 2004 | 7.00 | 1.45% |
| 2005 | 5.50 | -21.43% |
| 2006 | 5.10 | -7.27% |
| 2007 | 4.90 | -3.92% |
| 2008 | 5.30 | 8.16% |
| 2009 | 5.40 | 1.89% |
| 2010 | 3.90 | -27.78% |
| 2011 | 4.10 | 5.13% |
| 2012 | 4.30 | 4.88% |
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