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| year | consumption | change |
| 1986 | 145.00 | NA |
| 1987 | 136.00 | -6.21% |
| 1988 | 133.00 | -2.21% |
| 1989 | 129.00 | -3.01% |
| 1990 | 131.00 | 1.55% |
| 1991 | 139.00 | 6.11% |
| 1992 | 137.00 | -1.44% |
| 1993 | 131.00 | -4.38% |
| 1994 | 125.00 | -4.58% |
| 1995 | 130.00 | 4.00% |
| 1996 | 133.00 | 2.31% |
| 1997 | 126.00 | -5.26% |
| 1998 | 134.00 | 6.35% |
| 1999 | 132.00 | -1.49% |
| 2000 | 125.00 | -5.30% |
| 2001 | 131.00 | 4.80% |
| 2002 | 127.00 | -3.05% |
| 2003 | 134.00 | 5.51% |
| 2004 | 134.00 | 0.00% |
| 2005 | 139.00 | 3.73% |
| 2006 | 137.00 | -1.44% |
| 2007 | 127.00 | -7.30% |
| 2008 | 135.00 | 6.30% |
| 2009 | 133.00 | -1.48% |
| 2010 | 139.00 | 4.51% |
| 2011 | 122.00 | -12.23% |
| 2012 | 130.00 | 6.56% |
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