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| year | consumption | change |
| 1986 | 8.20 | NA |
| 1987 | 7.70 | -6.10% |
| 1988 | 10.00 | 29.87% |
| 1989 | 10.00 | 0.00% |
| 1990 | 8.50 | -15.00% |
| 1991 | 6.00 | -29.41% |
| 1992 | 6.40 | 6.67% |
| 1993 | 7.60 | 18.75% |
| 1994 | 8.30 | 9.21% |
| 1995 | 8.20 | -1.20% |
| 1996 | 7.20 | -12.20% |
| 1997 | 3.30 | -54.17% |
| 1998 | 2.20 | -33.33% |
| 1999 | 3.60 | 63.64% |
| 2000 | 6.70 | 86.11% |
| 2001 | 4.60 | -31.34% |
| 2002 | 3.90 | -15.22% |
| 2003 | 3.70 | -5.13% |
| 2004 | 4.20 | 13.51% |
| 2005 | 2.70 | -35.71% |
| 2006 | 2.40 | -11.11% |
| 2007 | 1.60 | -33.33% |
| 2008 | 1.60 | 0.00% |
| 2009 | 1.80 | 12.50% |
| 2010 | 1.60 | -11.11% |
| 2011 | 1.10 | -31.25% |
| 2012 | 4.60 | 318.18% |
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