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| year | consumption | change |
| 1992 | 1.68 | NA |
| 1993 | 1.72 | 2.75% |
| 1994 | 1.76 | 2.09% |
| 1995 | 1.86 | 6.03% |
| 1996 | 1.88 | 0.91% |
| 1997 | 1.88 | -0.21% |
| 1998 | 1.85 | -1.65% |
| 1999 | 1.86 | 1.03% |
| 2000 | 1.96 | 4.94% |
| 2001 | 2.05 | 4.60% |
| 2002 | 2.10 | 2.49% |
| 2003 | 2.13 | 1.48% |
| 2004 | 2.25 | 5.87% |
| 2005 | 2.16 | -4.04% |
| 2006 | 2.23 | 3.05% |
| 2007 | 2.23 | 0.00% |
| 2008 | 2.23 | 0.27% |
| 2009 | 2.00 | -10.56% |
| 2010 | 1.97 | -1.40% |
| 2011 | 2.14 | 8.78% |
| 2012 | 2.19 | 2.38% |
| 2013 | 2.04 | -7.06% |
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