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| year | consumption | change |
| 1986 | 5.30 | NA |
| 1987 | 5.80 | 9.43% |
| 1988 | 5.90 | 1.72% |
| 1989 | 6.30 | 6.78% |
| 1990 | 6.30 | 0.00% |
| 1991 | 5.70 | -9.52% |
| 1992 | 6.10 | 7.02% |
| 1993 | 6.60 | 8.20% |
| 1994 | 6.60 | 0.00% |
| 1995 | 6.80 | 3.03% |
| 1996 | 7.60 | 11.76% |
| 1997 | 7.60 | 0.00% |
| 1998 | 7.70 | 1.32% |
| 1999 | 8.10 | 5.19% |
| 2000 | 8.20 | 1.23% |
| 2001 | 7.30 | -10.98% |
| 2002 | 8.20 | 12.33% |
| 2003 | 8.50 | 3.66% |
| 2004 | 9.20 | 8.24% |
| 2005 | 8.80 | -4.35% |
| 2006 | 8.00 | -9.09% |
| 2007 | 7.90 | -1.25% |
| 2008 | 7.40 | -6.33% |
| 2009 | 7.10 | -4.05% |
| 2010 | 6.50 | -8.45% |
| 2011 | 6.10 | -6.15% |
| 2012 | 6.10 | 0.00% |
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