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| year | consumption | change |
| 1986 | 108.00 | NA |
| 1987 | 108.00 | 0.00% |
| 1988 | 100.00 | -7.41% |
| 1989 | 99.00 | -1.00% |
| 1990 | 91.00 | -8.08% |
| 1991 | 102.00 | 12.09% |
| 1992 | 109.00 | 6.86% |
| 1993 | 124.00 | 13.76% |
| 1994 | 125.00 | 0.81% |
| 1995 | 120.00 | -4.00% |
| 1996 | 128.00 | 6.67% |
| 1997 | 103.00 | -19.53% |
| 1998 | 94.00 | -8.74% |
| 1999 | 87.00 | -7.45% |
| 2000 | 97.00 | 11.49% |
| 2001 | 82.00 | -15.46% |
| 2002 | 62.00 | -24.39% |
| 2003 | 85.00 | 37.10% |
| 2004 | 47.00 | -44.71% |
| 2005 | 70.00 | 48.94% |
| 2006 | 82.00 | 17.14% |
| 2007 | 90.00 | 9.76% |
| 2008 | 93.00 | 3.33% |
| 2009 | 99.00 | 6.45% |
| 2010 | 107.00 | 8.08% |
| 2011 | 120.00 | 12.15% |
| 2012 | 133.00 | 10.83% |
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