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| year | consumption | change |
| 1986 | 23.00 | NA |
| 1987 | 19.00 | -17.39% |
| 1988 | 19.00 | 0.00% |
| 1989 | 19.00 | 0.00% |
| 1990 | 21.00 | 10.53% |
| 1991 | 26.00 | 23.81% |
| 1992 | 27.00 | 3.85% |
| 1993 | 12.00 | -55.56% |
| 1994 | 25.00 | 108.33% |
| 1995 | 27.00 | 8.00% |
| 1996 | 28.00 | 3.70% |
| 1997 | 25.00 | -10.71% |
| 1998 | 29.00 | 16.00% |
| 1999 | 21.00 | -27.59% |
| 2000 | 21.00 | 0.00% |
| 2001 | 24.00 | 14.29% |
| 2002 | 33.00 | 37.50% |
| 2003 | 24.00 | -27.27% |
| 2004 | 25.00 | 4.17% |
| 2005 | 28.00 | 12.00% |
| 2006 | 28.00 | 0.00% |
| 2007 | 24.00 | -14.29% |
| 2008 | 38.00 | 58.33% |
| 2009 | 46.00 | 21.05% |
| 2010 | 41.00 | -10.87% |
| 2011 | 45.00 | 9.76% |
| 2012 | 47.00 | 4.44% |
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