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| year | consumption | change |
| 1992 | 13.00 | NA |
| 1993 | 20.00 | 53.85% |
| 1994 | 20.00 | 0.00% |
| 1995 | 21.00 | 5.00% |
| 1996 | 20.00 | -4.76% |
| 1997 | 7.10 | -64.50% |
| 1998 | 3.80 | -46.48% |
| 1999 | 1.20 | -68.42% |
| 2000 | 2.60 | 116.67% |
| 2001 | 17.00 | 553.85% |
| 2002 | 21.00 | 23.53% |
| 2003 | 25.00 | 19.05% |
| 2004 | 14.00 | -44.00% |
| 2005 | 17.00 | 21.43% |
| 2006 | 19.00 | 11.76% |
| 2007 | 11.00 | -42.11% |
| 2008 | 9.70 | -11.82% |
| 2009 | 11.00 | 13.40% |
| 2010 | 10.00 | -9.09% |
| 2011 | 14.00 | 40.00% |
| 2012 | 11.00 | -21.43% |
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