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| year | consumption | change |
| 1986 | 4.40 | NA |
| 1987 | 4.90 | 11.36% |
| 1988 | 5.40 | 10.20% |
| 1989 | 5.20 | -3.70% |
| 1990 | 5.50 | 5.77% |
| 1991 | 6.90 | 25.45% |
| 1992 | 8.30 | 20.29% |
| 1993 | 7.20 | -13.25% |
| 1994 | 7.90 | 9.72% |
| 1995 | 15.00 | 89.87% |
| 1996 | 11.00 | -26.67% |
| 1997 | 8.90 | -19.09% |
| 1998 | 13.00 | 46.07% |
| 1999 | 13.00 | 0.00% |
| 2000 | 13.00 | 0.00% |
| 2001 | 13.00 | 0.00% |
| 2002 | 12.00 | -7.69% |
| 2003 | 13.00 | 8.33% |
| 2004 | 13.00 | 0.00% |
| 2005 | 14.00 | 7.69% |
| 2006 | 14.00 | 0.00% |
| 2007 | 13.00 | -7.14% |
| 2008 | 12.00 | -7.69% |
| 2009 | 13.00 | 8.33% |
| 2010 | 12.00 | -7.69% |
| 2011 | 12.00 | 0.00% |
| 2012 | 12.00 | 0.00% |
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