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| year | consumption | change |
| 1993 | 37.00 | NA |
| 1994 | 32.00 | -13.51% |
| 1995 | 23.00 | -28.13% |
| 1996 | 25.00 | 8.70% |
| 1997 | 23.00 | -8.00% |
| 1998 | 25.00 | 8.70% |
| 1999 | 22.00 | -12.00% |
| 2000 | 16.00 | -27.27% |
| 2001 | 16.00 | 0.00% |
| 2002 | 9.40 | -41.25% |
| 2003 | 9.20 | -2.13% |
| 2004 | 9.80 | 6.52% |
| 2005 | 9.50 | -3.06% |
| 2006 | 7.60 | -20.00% |
| 2007 | 7.20 | -5.26% |
| 2008 | 6.10 | -15.28% |
| 2009 | 5.60 | -8.20% |
| 2010 | 4.20 | -25.00% |
| 2011 | 3.00 | -28.57% |
| 2012 | 2.00 | -33.33% |
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