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| year | consumption | change |
| 1992 | 19.00 | NA |
| 1993 | 21.00 | 10.53% |
| 1994 | 18.00 | -14.29% |
| 1995 | 18.00 | 0.00% |
| 1996 | 23.00 | 27.78% |
| 1997 | 21.00 | -8.70% |
| 1998 | 22.00 | 4.76% |
| 1999 | 20.00 | -9.09% |
| 2000 | 22.00 | 10.00% |
| 2001 | 18.00 | -18.18% |
| 2002 | 20.00 | 11.11% |
| 2003 | 20.00 | 0.00% |
| 2004 | 20.00 | 0.00% |
| 2005 | 20.00 | 0.00% |
| 2006 | 20.00 | 0.00% |
| 2007 | 20.00 | 0.00% |
| 2008 | 19.00 | -5.00% |
| 2009 | 19.00 | 0.00% |
| 2010 | 19.00 | 0.00% |
| 2011 | 19.00 | 0.00% |
| 2012 | 19.00 | 0.00% |
| 2013 | 19.00 | 0.00% |
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