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| year | consumption | change |
| 1986 | 7.00 | NA |
| 1987 | 4.60 | -34.29% |
| 1988 | 4.50 | -2.17% |
| 1989 | 4.50 | 0.00% |
| 1990 | 4.80 | 6.67% |
| 1991 | 3.40 | -29.17% |
| 1992 | 8.40 | 147.06% |
| 1993 | 8.60 | 2.38% |
| 1994 | 5.50 | -36.05% |
| 1995 | 9.50 | 72.73% |
| 1996 | 8.60 | -9.47% |
| 1997 | 9.70 | 12.79% |
| 1998 | 18.00 | 85.57% |
| 1999 | 10.00 | -44.44% |
| 2000 | 11.00 | 10.00% |
| 2001 | 11.00 | 0.00% |
| 2002 | 11.00 | 0.00% |
| 2003 | 11.00 | 0.00% |
| 2004 | 11.00 | 0.00% |
| 2005 | 18.00 | 63.64% |
| 2006 | 11.00 | -38.89% |
| 2007 | 9.30 | -15.45% |
| 2008 | 9.00 | -3.23% |
| 2009 | 10.00 | 11.11% |
| 2010 | 11.00 | 10.00% |
| 2011 | 13.00 | 18.18% |
| 2012 | 12.00 | -7.69% |
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