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| year | consumption | change |
| 1992 | 12.00 | NA |
| 1993 | 13.00 | 8.33% |
| 1994 | 11.00 | -15.38% |
| 1995 | 9.10 | -17.27% |
| 1996 | 10.00 | 9.89% |
| 1997 | 14.00 | 40.00% |
| 1998 | 15.00 | 7.14% |
| 1999 | 14.00 | -6.67% |
| 2000 | 22.00 | 57.14% |
| 2001 | 32.00 | 45.45% |
| 2002 | 37.00 | 15.63% |
| 2003 | 8.60 | -76.76% |
| 2004 | 10.00 | 16.28% |
| 2005 | 15.00 | 50.00% |
| 2006 | 20.00 | 33.33% |
| 2007 | 26.00 | 30.00% |
| 2008 | 13.00 | -50.00% |
| 2009 | 7.50 | -42.31% |
| 2010 | 6.50 | -13.33% |
| 2011 | 10.00 | 53.85% |
| 2012 | 11.00 | 10.00% |
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