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| year | consumption | change |
| 1992 | 20.00 | NA |
| 1993 | 9.90 | -50.50% |
| 1994 | 11.00 | 11.11% |
| 1995 | 11.00 | 0.00% |
| 1996 | 10.00 | -9.09% |
| 1997 | 10.00 | 0.00% |
| 1998 | 10.00 | 0.00% |
| 1999 | 8.80 | -12.00% |
| 2000 | 9.20 | 4.55% |
| 2001 | 8.50 | -7.61% |
| 2002 | 7.60 | -10.59% |
| 2003 | 7.80 | 2.63% |
| 2004 | 9.70 | 24.36% |
| 2005 | 7.70 | -20.62% |
| 2006 | 8.10 | 5.19% |
| 2007 | 8.20 | 1.23% |
| 2008 | 8.60 | 4.88% |
| 2009 | 8.00 | -6.98% |
| 2010 | 7.60 | -5.00% |
| 2011 | 7.80 | 2.63% |
| 2012 | 7.50 | -3.85% |
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