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| year | consumption | change |
| 1992 | 5.70 | NA |
| 1993 | 6.50 | 14.04% |
| 1994 | 3.40 | -47.69% |
| 1995 | 3.10 | -8.82% |
| 1996 | 3.00 | -3.23% |
| 1997 | 2.90 | -3.33% |
| 1998 | 3.30 | 13.79% |
| 1999 | 1.50 | -54.55% |
| 2000 | 1.00 | -33.33% |
| 2001 | 4.70 | 370.00% |
| 2002 | 1.30 | -72.34% |
| 2003 | 1.50 | 15.38% |
| 2004 | 1.60 | 6.67% |
| 2005 | 1.70 | 6.25% |
| 2006 | 2.00 | 17.65% |
| 2007 | 2.20 | 10.00% |
| 2008 | 4.20 | 90.91% |
| 2009 | 4.40 | 4.76% |
| 2010 | 4.10 | -6.82% |
| 2011 | 4.50 | 9.76% |
| 2012 | 4.80 | 6.67% |
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