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| year | consumption | change |
| 1986 | 10.00 | NA |
| 1987 | 9.20 | -8.00% |
| 1988 | 8.30 | -9.78% |
| 1989 | 7.50 | -9.64% |
| 1990 | 7.60 | 1.33% |
| 1991 | 7.60 | 0.00% |
| 1992 | 8.00 | 5.26% |
| 1993 | 7.30 | -8.75% |
| 1994 | 10.00 | 36.99% |
| 1995 | 8.10 | -19.00% |
| 1996 | 8.20 | 1.23% |
| 1997 | 11.00 | 34.15% |
| 1998 | 8.60 | -21.82% |
| 1999 | 9.30 | 8.14% |
| 2000 | 9.90 | 6.45% |
| 2001 | 9.80 | -1.01% |
| 2002 | 9.10 | -7.14% |
| 2003 | 10.00 | 9.89% |
| 2004 | 8.80 | -12.00% |
| 2005 | 11.00 | 25.00% |
| 2006 | 12.00 | 9.09% |
| 2007 | 11.00 | -8.33% |
| 2008 | 13.00 | 18.18% |
| 2009 | 9.20 | -29.23% |
| 2010 | 12.00 | 30.43% |
| 2011 | 15.00 | 25.00% |
| 2012 | 8.20 | -45.33% |
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