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| year | consumption | change |
| 1992 | 7.90 | NA |
| 1993 | 5.70 | -27.85% |
| 1994 | 1.80 | -68.42% |
| 1995 | 2.70 | 50.00% |
| 1996 | 2.70 | 0.00% |
| 1997 | 2.00 | -25.93% |
| 1998 | 1.70 | -15.00% |
| 1999 | 2.80 | 64.71% |
| 2000 | 7.30 | 160.71% |
| 2001 | 7.80 | 6.85% |
| 2002 | 1.70 | -78.21% |
| 2003 | 2.00 | 17.65% |
| 2004 | 2.80 | 40.00% |
| 2005 | 2.50 | -10.71% |
| 2006 | 2.60 | 4.00% |
| 2007 | 3.30 | 26.92% |
| 2008 | 3.60 | 9.09% |
| 2009 | 11.00 | 205.56% |
| 2010 | 6.50 | -40.91% |
| 2011 | 9.10 | 40.00% |
| 2012 | 11.00 | 20.88% |
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