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| year | consumption | change |
| 1992 | 14.00 | NA |
| 1993 | 18.00 | 28.57% |
| 1994 | 19.00 | 5.56% |
| 1995 | 14.00 | -26.32% |
| 1996 | 9.30 | -33.57% |
| 1997 | 18.00 | 93.55% |
| 1998 | 7.30 | -59.44% |
| 1999 | 7.30 | 0.00% |
| 2000 | 14.00 | 91.78% |
| 2001 | 21.00 | 50.00% |
| 2002 | 20.00 | -4.76% |
| 2003 | 19.00 | -5.00% |
| 2004 | 19.00 | 0.00% |
| 2005 | 20.00 | 5.26% |
| 2006 | 23.00 | 15.00% |
| 2007 | 33.00 | 43.48% |
| 2008 | 24.00 | -27.27% |
| 2009 | 21.00 | -12.50% |
| 2010 | 35.00 | 66.67% |
| 2011 | 36.00 | 2.86% |
| 2012 | 44.00 | 22.22% |
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