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| year | consumption | change |
| 1992 | 5.00 | NA |
| 1993 | 5.60 | 12.00% |
| 1994 | 1.10 | -80.36% |
| 1995 | 4.90 | 345.45% |
| 1996 | 6.30 | 28.57% |
| 1997 | 7.50 | 19.05% |
| 1998 | 6.20 | -17.33% |
| 1999 | 6.60 | 6.45% |
| 2000 | 6.30 | -4.55% |
| 2001 | 5.30 | -15.87% |
| 2002 | 5.80 | 9.43% |
| 2003 | 6.80 | 17.24% |
| 2004 | 6.90 | 1.47% |
| 2005 | 7.10 | 2.90% |
| 2006 | 7.20 | 1.41% |
| 2007 | 7.40 | 2.78% |
| 2008 | 7.10 | -4.05% |
| 2009 | 7.70 | 8.45% |
| 2010 | 8.10 | 5.19% |
| 2011 | 8.50 | 4.94% |
| 2012 | 8.50 | 0.00% |
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