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| year | consumption | change |
| 1992 | 10.00 | NA |
| 1993 | 4.70 | -53.00% |
| 1994 | 1.90 | -59.57% |
| 1995 | 1.70 | -10.53% |
| 1996 | 3.00 | 76.47% |
| 1997 | 1.60 | -46.67% |
| 1998 | 2.00 | 25.00% |
| 1999 | 1.60 | -20.00% |
| 2000 | 5.10 | 218.75% |
| 2001 | 4.60 | -9.80% |
| 2002 | 1.10 | -76.09% |
| 2003 | 1.40 | 27.27% |
| 2004 | 1.10 | -21.43% |
| 2005 | 1.40 | 27.27% |
| 2006 | 1.00 | -28.57% |
| 2007 | 1.30 | 30.00% |
| 2008 | 1.20 | -7.69% |
| 2009 | 4.60 | 283.33% |
| 2010 | 2.40 | -47.83% |
| 2011 | 2.50 | 4.17% |
| 2012 | 1.50 | -40.00% |
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