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| year | consumption | change |
| 1986 | 19.00 | NA |
| 1987 | 19.00 | 0.00% |
| 1988 | 20.00 | 5.26% |
| 1989 | 22.00 | 10.00% |
| 1990 | 26.00 | 18.18% |
| 1991 | 20.00 | -23.08% |
| 1992 | 13.00 | -35.00% |
| 1993 | 14.00 | 7.69% |
| 1994 | 13.00 | -7.14% |
| 1995 | 13.00 | 0.00% |
| 1996 | 13.00 | 0.00% |
| 1997 | 11.00 | -15.38% |
| 1998 | 11.00 | 0.00% |
| 1999 | 11.00 | 0.00% |
| 2000 | 9.40 | -14.55% |
| 2001 | 7.50 | -20.21% |
| 2002 | 6.60 | -12.00% |
| 2003 | 5.50 | -16.67% |
| 2004 | 4.30 | -21.82% |
| 2005 | 6.30 | 46.51% |
| 2006 | 4.50 | -28.57% |
| 2007 | 4.80 | 6.67% |
| 2008 | 4.00 | -16.67% |
| 2009 | 3.50 | -12.50% |
| 2010 | 5.20 | 48.57% |
| 2011 | 3.20 | -38.46% |
| 2012 | 3.50 | 9.38% |
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