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| year | consumption | change |
| 1992 | 16.00 | NA |
| 1993 | 19.00 | 18.75% |
| 1994 | 16.00 | -15.79% |
| 1995 | 16.00 | 0.00% |
| 1996 | 14.00 | -12.50% |
| 1997 | 17.00 | 21.43% |
| 1998 | 20.00 | 17.65% |
| 1999 | 15.00 | -25.00% |
| 2000 | 15.00 | 0.00% |
| 2001 | 14.00 | -6.67% |
| 2002 | 15.00 | 7.14% |
| 2003 | 20.00 | 33.33% |
| 2004 | 19.00 | -5.00% |
| 2005 | 20.00 | 5.26% |
| 2006 | 24.00 | 20.00% |
| 2007 | 20.00 | -16.67% |
| 2008 | 22.00 | 10.00% |
| 2009 | 21.00 | -4.55% |
| 2010 | 24.00 | 14.29% |
| 2011 | 25.00 | 4.17% |
| 2012 | 24.00 | -4.00% |
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