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| year | consumption | change |
| 1986 | 9.40 | NA |
| 1987 | 9.00 | -4.26% |
| 1988 | 8.90 | -1.11% |
| 1989 | 14.00 | 57.30% |
| 1990 | 7.70 | -45.00% |
| 1991 | 7.10 | -7.79% |
| 1992 | 7.00 | -1.41% |
| 1993 | 13.00 | 85.71% |
| 1994 | 8.50 | -34.62% |
| 1995 | 9.20 | 8.24% |
| 1996 | 8.40 | -8.70% |
| 1997 | 8.20 | -2.38% |
| 1998 | 9.70 | 18.29% |
| 1999 | 9.10 | -6.19% |
| 2000 | 9.20 | 1.10% |
| 2001 | 10.00 | 8.70% |
| 2002 | 11.00 | 10.00% |
| 2003 | 11.00 | 0.00% |
| 2004 | 13.00 | 18.18% |
| 2005 | 17.00 | 30.77% |
| 2006 | 20.00 | 17.65% |
| 2007 | 23.00 | 15.00% |
| 2008 | 18.00 | -21.74% |
| 2009 | 20.00 | 11.11% |
| 2010 | 15.00 | -25.00% |
| 2011 | 14.00 | -6.67% |
| 2012 | 14.00 | 0.00% |
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