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| year | consumption | change |
| 1993 | 31.00 | NA |
| 1994 | 36.00 | 16.13% |
| 1995 | 38.00 | 5.56% |
| 1996 | 43.00 | 13.16% |
| 1997 | 43.00 | 0.00% |
| 1998 | 42.00 | -2.33% |
| 1999 | 45.00 | 7.14% |
| 2000 | 43.00 | -4.44% |
| 2001 | 44.00 | 2.33% |
| 2002 | 45.00 | 2.27% |
| 2003 | 49.00 | 8.89% |
| 2004 | 48.00 | -2.04% |
| 2005 | 48.00 | 0.00% |
| 2006 | 47.00 | -2.08% |
| 2007 | 49.00 | 4.26% |
| 2008 | 48.00 | -2.04% |
| 2009 | 47.00 | -2.08% |
| 2010 | 43.00 | -8.51% |
| 2011 | 41.00 | -4.65% |
| 2012 | 39.00 | -4.88% |
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