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| year | consumption | change |
| 1986 | 82.00 | NA |
| 1987 | 87.00 | 6.10% |
| 1988 | 86.00 | -1.15% |
| 1989 | 84.00 | -2.33% |
| 1990 | 86.00 | 2.38% |
| 1991 | 83.00 | -3.49% |
| 1992 | 82.00 | -1.20% |
| 1993 | 79.00 | -3.66% |
| 1994 | 82.00 | 3.80% |
| 1995 | 81.00 | -1.22% |
| 1996 | 82.00 | 1.23% |
| 1997 | 82.00 | 0.00% |
| 1998 | 84.00 | 2.44% |
| 1999 | 85.00 | 1.19% |
| 2000 | 87.00 | 2.35% |
| 2001 | 88.00 | 1.15% |
| 2002 | 87.00 | -1.14% |
| 2003 | 89.00 | 2.30% |
| 2004 | 87.00 | -2.25% |
| 2005 | 85.00 | -2.30% |
| 2006 | 85.00 | 0.00% |
| 2007 | 85.00 | 0.00% |
| 2008 | 84.00 | -1.18% |
| 2009 | 83.00 | -1.19% |
| 2010 | 88.00 | 6.02% |
| 2011 | 86.00 | -2.27% |
| 2012 | 86.00 | 0.00% |
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