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| year | consumption | change |
| 1986 | 28.00 | NA |
| 1987 | 26.00 | -7.14% |
| 1988 | 27.00 | 3.85% |
| 1989 | 26.00 | -3.70% |
| 1990 | 25.00 | -3.85% |
| 1991 | 23.00 | -8.00% |
| 1992 | 20.00 | -13.04% |
| 1993 | 20.00 | 0.00% |
| 1994 | 20.00 | 0.00% |
| 1995 | 21.00 | 5.00% |
| 1996 | 25.00 | 19.05% |
| 1997 | 12.00 | -52.00% |
| 1998 | 9.30 | -22.50% |
| 1999 | 9.50 | 2.15% |
| 2000 | 11.00 | 15.79% |
| 2001 | 13.00 | 18.18% |
| 2002 | 8.10 | -37.69% |
| 2003 | 9.60 | 18.52% |
| 2004 | 8.30 | -13.54% |
| 2005 | 8.30 | 0.00% |
| 2006 | 10.00 | 20.48% |
| 2007 | 20.00 | 100.00% |
| 2008 | 7.40 | -63.00% |
| 2009 | 5.70 | -22.97% |
| 2010 | 6.20 | 8.77% |
| 2011 | 6.50 | 4.84% |
| 2012 | 10.00 | 53.85% |
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