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| year | consumption | change |
| 1993 | 1.20 | NA |
| 1994 | 1.20 | 0.00 % |
| 1995 | 1.10 | -8.33 % |
| 1996 | 1.00 | -9.09 % |
| 1997 | 1.10 | 10.00 % |
| 1998 | 1.00 | -9.09 % |
| 1999 | 1.00 | 0.00 % |
| 2000 | 1.00 | 0.00 % |
| 2001 | 6.40 | 540.00 % |
| 2002 | 6.70 | 4.69 % |
| 2003 | 6.90 | 2.99 % |
| 2004 | 7.00 | 1.45 % |
| 2005 | 5.50 | -21.43 % |
| 2006 | 5.10 | -7.27 % |
| 2007 | 4.90 | -3.92 % |
| 2008 | 5.30 | 8.16 % |
| 2009 | 5.40 | 1.89 % |
| 2010 | 3.90 | -27.78 % |
| 2011 | 4.10 | 5.13 % |
| 2012 | 4.30 | 4.88 % |
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