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| year | consumption | change |
| 1986 | 7.20 | NA |
| 1987 | 5.90 | -18.06% |
| 1988 | 5.60 | -5.08% |
| 1989 | 9.10 | 62.50% |
| 1990 | 7.90 | -13.19% |
| 1991 | 8.20 | 3.80% |
| 1992 | 8.10 | -1.22% |
| 1993 | 8.20 | 1.23% |
| 1994 | 7.80 | -4.88% |
| 1995 | 7.90 | 1.28% |
| 1996 | 9.00 | 13.92% |
| 1997 | 5.30 | -41.11% |
| 1998 | 9.30 | 75.47% |
| 1999 | 9.90 | 6.45% |
| 2000 | 11.00 | 11.11% |
| 2001 | 9.50 | -13.64% |
| 2002 | 9.00 | -5.26% |
| 2003 | 7.90 | -12.22% |
| 2004 | 8.00 | 1.27% |
| 2005 | 9.10 | 13.75% |
| 2006 | 10.00 | 9.89% |
| 2007 | 10.00 | 0.00% |
| 2008 | 8.90 | -11.00% |
| 2009 | 11.00 | 23.60% |
| 2010 | 13.00 | 18.18% |
| 2011 | 13.00 | 0.00% |
| 2012 | 14.00 | 7.69% |
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