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| year | consumption | change |
| 1986 | 107.00 | NA |
| 1987 | 106.00 | -0.93% |
| 1988 | 100.00 | -5.66% |
| 1989 | 94.00 | -6.00% |
| 1990 | 92.00 | -2.13% |
| 1991 | 96.00 | 4.35% |
| 1992 | 93.00 | -3.13% |
| 1993 | 92.00 | -1.08% |
| 1994 | 94.00 | 2.17% |
| 1995 | 97.00 | 3.19% |
| 1996 | 99.00 | 2.06% |
| 1997 | 95.00 | -4.04% |
| 1998 | 97.00 | 2.11% |
| 1999 | 93.00 | -4.12% |
| 2000 | 87.00 | -6.45% |
| 2001 | 88.00 | 1.15% |
| 2002 | 86.00 | -2.27% |
| 2003 | 86.00 | 0.00% |
| 2004 | 85.00 | -1.16% |
| 2005 | 83.00 | -2.35% |
| 2006 | 85.00 | 2.41% |
| 2007 | 86.00 | 1.18% |
| 2008 | 87.00 | 1.16% |
| 2009 | 85.00 | -2.30% |
| 2010 | 86.00 | 1.18% |
| 2011 | 84.00 | -2.33% |
| 2012 | 81.00 | -3.57% |
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