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| year | consumption | change |
| 1986 | 106.00 | NA |
| 1987 | 105.00 | -0.94% |
| 1988 | 109.00 | 3.81% |
| 1989 | 113.00 | 3.67% |
| 1990 | 112.00 | -0.88% |
| 1991 | 106.00 | -5.36% |
| 1992 | 90.00 | -15.09% |
| 1993 | 89.00 | -1.11% |
| 1994 | 86.00 | -3.37% |
| 1995 | 87.00 | 1.16% |
| 1996 | 79.00 | -9.20% |
| 1997 | 75.00 | -5.06% |
| 1998 | 95.00 | 26.67% |
| 1999 | 97.00 | 2.11% |
| 2000 | 93.00 | -4.12% |
| 2001 | 95.00 | 2.15% |
| 2002 | 107.00 | 12.63% |
| 2003 | 108.00 | 0.93% |
| 2004 | 94.00 | -12.96% |
| 2005 | 93.00 | -1.06% |
| 2006 | 42.00 | -54.84% |
| 2007 | 43.00 | 2.38% |
| 2008 | 88.00 | 104.65% |
| 2009 | 49.00 | -44.32% |
| 2010 | 61.00 | 24.49% |
| 2011 | 52.00 | -14.75% |
| 2012 | 49.00 | -5.77% |
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