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| year | consumption | change |
| 1986 | 8.80 | NA |
| 1987 | 9.40 | 6.82% |
| 1988 | 8.90 | -5.32% |
| 1989 | 8.80 | -1.12% |
| 1990 | 8.00 | -9.09% |
| 1991 | 9.10 | 13.75% |
| 1992 | 5.50 | -39.56% |
| 1993 | 6.40 | 16.36% |
| 1994 | 4.20 | -34.38% |
| 1995 | 5.00 | 19.05% |
| 1996 | 3.60 | -28.00% |
| 1997 | 7.20 | 100.00% |
| 1998 | 7.40 | 2.78% |
| 1999 | 7.40 | 0.00% |
| 2000 | 7.70 | 4.05% |
| 2001 | 8.40 | 9.09% |
| 2002 | 7.60 | -9.52% |
| 2003 | 7.90 | 3.95% |
| 2004 | 7.20 | -8.86% |
| 2005 | 8.00 | 11.11% |
| 2006 | 2.80 | -65.00% |
| 2007 | 11.00 | 292.86% |
| 2008 | 11.00 | 0.00% |
| 2009 | 11.00 | 0.00% |
| 2010 | 11.00 | 0.00% |
| 2011 | 12.00 | 9.09% |
| 2012 | 12.00 | 0.00% |
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