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| year | consumption | change |
| 1986 | 15.00 | NA |
| 1987 | 14.00 | -6.67% |
| 1988 | 13.00 | -7.14% |
| 1989 | 14.00 | 7.69% |
| 1990 | 13.00 | -7.14% |
| 1991 | 12.00 | -7.69% |
| 1992 | 12.00 | 0.00% |
| 1993 | 12.00 | 0.00% |
| 1994 | 13.00 | 8.33% |
| 1995 | 12.00 | -7.69% |
| 1996 | 12.00 | 0.00% |
| 1997 | 4.60 | -61.67% |
| 1998 | 3.20 | -30.43% |
| 1999 | 3.00 | -6.25% |
| 2000 | 4.70 | 56.67% |
| 2001 | 3.70 | -21.28% |
| 2002 | 2.50 | -32.43% |
| 2003 | 2.70 | 8.00% |
| 2004 | 5.40 | 100.00% |
| 2005 | 5.40 | 0.00% |
| 2006 | 2.90 | -46.30% |
| 2007 | 8.80 | 203.45% |
| 2008 | 1.80 | -79.55% |
| 2009 | 1.70 | -5.56% |
| 2010 | 1.70 | 0.00% |
| 2011 | 1.70 | 0.00% |
| 2012 | 1.70 | 0.00% |
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