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| year | consumption | change |
| 1986 | 11.00 | NA |
| 1987 | 10.00 | -9.09% |
| 1988 | 12.00 | 20.00% |
| 1989 | 12.00 | 0.00% |
| 1990 | 12.00 | 0.00% |
| 1991 | 9.30 | -22.50% |
| 1992 | 12.00 | 29.03% |
| 1993 | 12.00 | 0.00% |
| 1994 | 11.00 | -8.33% |
| 1995 | 14.00 | 27.27% |
| 1996 | 14.00 | 0.00% |
| 1997 | 14.00 | 0.00% |
| 1998 | 13.00 | -7.14% |
| 1999 | 12.00 | -7.69% |
| 2000 | 14.00 | 16.67% |
| 2001 | 12.00 | -14.29% |
| 2002 | 13.00 | 8.33% |
| 2003 | 15.00 | 15.38% |
| 2004 | 20.00 | 33.33% |
| 2005 | 20.00 | 0.00% |
| 2006 | 22.00 | 10.00% |
| 2007 | 23.00 | 4.55% |
| 2008 | 24.00 | 4.35% |
| 2009 | 29.00 | 20.83% |
| 2010 | 27.00 | -6.90% |
| 2011 | 31.00 | 14.81% |
| 2012 | 31.00 | 0.00% |
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