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| year | consumption | change |
| 1991 | 94.00 | NA |
| 1992 | 94.00 | 0.00% |
| 1993 | 96.00 | 2.13% |
| 1994 | 109.00 | 13.54% |
| 1995 | 107.00 | -1.83% |
| 1996 | 105.00 | -1.87% |
| 1997 | 98.00 | -6.67% |
| 1998 | 92.00 | -6.12% |
| 1999 | 84.00 | -8.70% |
| 2000 | 87.00 | 3.57% |
| 2001 | 90.00 | 3.45% |
| 2002 | 83.00 | -7.78% |
| 2003 | 86.00 | 3.61% |
| 2004 | 87.00 | 1.16% |
| 2005 | 90.00 | 3.45% |
| 2006 | 92.00 | 2.22% |
| 2007 | 96.00 | 4.35% |
| 2008 | 102.00 | 6.25% |
| 2009 | 101.00 | -0.98% |
| 2010 | 106.00 | 4.95% |
| 2011 | 102.00 | -3.77% |
| 2012 | 104.00 | 1.96% |
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