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| year | consumption | change |
| 1986 | 75.00 | NA |
| 1987 | 81.00 | 8.00% |
| 1988 | 82.00 | 1.23% |
| 1989 | 88.00 | 7.32% |
| 1990 | 93.00 | 5.68% |
| 1991 | 91.00 | -2.15% |
| 1992 | 93.00 | 2.20% |
| 1993 | 97.00 | 4.30% |
| 1994 | 99.00 | 2.06% |
| 1995 | 104.00 | 5.05% |
| 1996 | 100.00 | -3.85% |
| 1997 | 101.00 | 1.00% |
| 1998 | 108.00 | 6.93% |
| 1999 | 102.00 | -5.56% |
| 2000 | 107.00 | 4.90% |
| 2001 | 107.00 | 0.00% |
| 2002 | 101.00 | -5.61% |
| 2003 | 102.00 | 0.99% |
| 2004 | 103.00 | 0.98% |
| 2005 | 99.00 | -3.88% |
| 2006 | 108.00 | 9.09% |
| 2007 | 108.00 | 0.00% |
| 2008 | 107.00 | -0.93% |
| 2009 | 92.00 | -14.02% |
| 2010 | 83.00 | -9.78% |
| 2011 | 77.00 | -7.23% |
| 2012 | 71.00 | -7.79% |
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