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| year | consumption | change |
| 1986 | 5.60 | NA |
| 1987 | 7.40 | 32.14% |
| 1988 | 6.50 | -12.16% |
| 1989 | 6.50 | 0.00% |
| 1990 | 6.60 | 1.54% |
| 1991 | 6.40 | -3.03% |
| 1992 | 6.40 | 0.00% |
| 1993 | 6.40 | 0.00% |
| 1994 | 6.30 | -1.56% |
| 1995 | 6.30 | 0.00% |
| 1996 | 6.30 | 0.00% |
| 1997 | 6.40 | 1.59% |
| 1998 | 6.20 | -3.13% |
| 1999 | 6.20 | 0.00% |
| 2000 | 6.30 | 1.61% |
| 2001 | 6.30 | 0.00% |
| 2002 | 11.00 | 74.60% |
| 2003 | 12.00 | 9.09% |
| 2004 | 12.00 | 0.00% |
| 2005 | 12.00 | 0.00% |
| 2006 | 13.00 | 8.33% |
| 2007 | 14.00 | 7.69% |
| 2008 | 8.40 | -40.00% |
| 2009 | 8.40 | 0.00% |
| 2010 | 8.70 | 3.57% |
| 2011 | 8.40 | -3.45% |
| 2012 | 8.40 | 0.00% |
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