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| year | consumption | change |
| 1986 | 5.50 | NA |
| 1987 | 5.00 | -9.09% |
| 1988 | 5.00 | 0.00% |
| 1989 | 5.00 | 0.00% |
| 1990 | 5.90 | 18.00% |
| 1991 | 5.70 | -3.39% |
| 1992 | 5.40 | -5.26% |
| 1993 | 4.10 | -24.07% |
| 1994 | 4.90 | 19.51% |
| 1995 | 4.80 | -2.04% |
| 1996 | 4.80 | 0.00% |
| 1997 | 4.90 | 2.08% |
| 1998 | 4.80 | -2.04% |
| 1999 | 6.20 | 29.17% |
| 2000 | 7.30 | 17.74% |
| 2001 | 7.40 | 1.37% |
| 2002 | 8.60 | 16.22% |
| 2003 | 9.00 | 4.65% |
| 2004 | 8.10 | -10.00% |
| 2005 | 8.30 | 2.47% |
| 2006 | 9.10 | 9.64% |
| 2007 | 11.00 | 20.88% |
| 2008 | 13.00 | 18.18% |
| 2009 | 13.00 | 0.00% |
| 2010 | 14.00 | 7.69% |
| 2011 | 17.00 | 21.43% |
| 2012 | 18.00 | 5.88% |
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