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| year | consumption | change |
| 1993 | 3.30 | NA |
| 1994 | 3.60 | 9.09% |
| 1995 | 5.70 | 58.33% |
| 1996 | 5.80 | 1.75% |
| 1997 | 6.90 | 18.97% |
| 1998 | 7.40 | 7.25% |
| 1999 | 7.80 | 5.41% |
| 2000 | 8.40 | 7.69% |
| 2001 | 8.70 | 3.57% |
| 2002 | 7.70 | -11.49% |
| 2003 | 7.80 | 1.30% |
| 2004 | 9.00 | 15.38% |
| 2005 | 8.30 | -7.78% |
| 2006 | 7.70 | -7.23% |
| 2007 | 6.80 | -11.69% |
| 2008 | 6.90 | 1.47% |
| 2009 | 6.00 | -13.04% |
| 2010 | 5.90 | -1.67% |
| 2011 | 6.00 | 1.69% |
| 2012 | 6.60 | 10.00% |
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