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| year | consumption | change |
| 1992 | 3.40 | NA |
| 1993 | 2.50 | -26.47% |
| 1994 | 1.70 | -32.00% |
| 1995 | 1.70 | 0.00% |
| 1996 | 2.80 | 64.71% |
| 1997 | 3.00 | 7.14% |
| 1998 | 2.90 | -3.33% |
| 1999 | 4.80 | 65.52% |
| 2000 | 6.20 | 29.17% |
| 2001 | 14.00 | 125.81% |
| 2002 | 2.10 | -85.00% |
| 2003 | 2.60 | 23.81% |
| 2004 | 3.30 | 26.92% |
| 2005 | 3.90 | 18.18% |
| 2006 | 5.00 | 28.21% |
| 2007 | 5.40 | 8.00% |
| 2008 | 5.40 | 0.00% |
| 2009 | 7.80 | 44.44% |
| 2010 | 7.80 | 0.00% |
| 2011 | 8.90 | 14.10% |
| 2012 | 8.40 | -5.62% |
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