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| year | consumption | change |
| 1992 | 13.00 | NA |
| 1993 | 13.00 | 0.00% |
| 1994 | 16.00 | 23.08% |
| 1995 | 9.80 | -38.75% |
| 1996 | 13.00 | 32.65% |
| 1997 | 5.90 | -54.62% |
| 1998 | 1.70 | -71.19% |
| 1999 | 4.70 | 176.47% |
| 2000 | 2.80 | -40.43% |
| 2001 | 3.20 | 14.29% |
| 2002 | 3.70 | 15.63% |
| 2003 | 8.90 | 140.54% |
| 2004 | 5.50 | -38.20% |
| 2005 | 5.50 | 0.00% |
| 2006 | 4.90 | -10.91% |
| 2007 | 4.50 | -8.16% |
| 2008 | 3.00 | -33.33% |
| 2009 | 2.90 | -3.33% |
| 2010 | 3.00 | 3.45% |
| 2011 | 4.60 | 53.33% |
| 2012 | 4.20 | -8.70% |
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