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| year | consumption | change |
| 1992 | 48.00 | NA |
| 1993 | 45.00 | -6.25 % |
| 1994 | 44.00 | -2.22 % |
| 1995 | 43.00 | -2.27 % |
| 1996 | 27.00 | -37.21 % |
| 1997 | 31.00 | 14.81 % |
| 1998 | 32.00 | 3.23 % |
| 1999 | 37.00 | 15.63 % |
| 2000 | 39.00 | 5.41 % |
| 2001 | 43.00 | 10.26 % |
| 2002 | 39.00 | -9.30 % |
| 2003 | 42.00 | 7.69 % |
| 2004 | 40.00 | -4.76 % |
| 2005 | 37.00 | -7.50 % |
| 2006 | 30.00 | -18.92 % |
| 2007 | 33.00 | 10.00 % |
| 2008 | 34.00 | 3.03 % |
| 2009 | 37.00 | 8.82 % |
| 2010 | 33.00 | -10.81 % |
| 2011 | 30.00 | -9.09 % |
| 2012 | 28.00 | -6.67 % |
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