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| year | consumption | change |
| 1992 | 22.00 | NA |
| 1993 | 23.00 | 4.55% |
| 1994 | 8.90 | -61.30% |
| 1995 | 7.10 | -20.22% |
| 1996 | 6.30 | -11.27% |
| 1997 | 4.40 | -30.16% |
| 1998 | 3.60 | -18.18% |
| 1999 | 1.30 | -63.89% |
| 2000 | 5.60 | 330.77% |
| 2001 | 10.00 | 78.57% |
| 2002 | 9.50 | -5.00% |
| 2003 | .50 | -94.74% |
| 2004 | .40 | -20.00% |
| 2005 | .30 | -25.00% |
| 2006 | .60 | 100.00% |
| 2007 | .10 | -83.33% |
| 2008 | .30 | 200.00% |
| 2009 | .40 | 33.33% |
| 2010 | .50 | 25.00% |
| 2011 | .30 | -40.00% |
| 2012 | .30 | 0.00% |
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