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| year | consumption | change |
| 1992 | 1.60 | NA |
| 1993 | 1.30 | -18.75% |
| 1994 | 1.20 | -7.69% |
| 1995 | 1.10 | -8.33% |
| 1996 | 1.20 | 9.09% |
| 1997 | 1.30 | 8.33% |
| 1998 | 1.20 | -7.69% |
| 1999 | 1.10 | -8.33% |
| 2000 | 1.30 | 18.18% |
| 2001 | 1.90 | 46.15% |
| 2002 | 1.50 | -21.05% |
| 2003 | 2.40 | 60.00% |
| 2004 | 2.90 | 20.83% |
| 2005 | 3.00 | 3.45% |
| 2006 | 3.50 | 16.67% |
| 2007 | 4.30 | 22.86% |
| 2008 | 5.00 | 16.28% |
| 2009 | 5.80 | 16.00% |
| 2010 | 6.60 | 13.79% |
| 2011 | 6.60 | 0.00% |
| 2012 | 7.80 | 18.18% |
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