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| year | consumption | change |
| 1986 | 19.00 | NA |
| 1987 | 20.00 | 5.26% |
| 1988 | 22.00 | 10.00% |
| 1989 | 27.00 | 22.73% |
| 1990 | 26.00 | -3.70% |
| 1991 | 29.00 | 11.54% |
| 1992 | 29.00 | 0.00% |
| 1993 | 27.00 | -6.90% |
| 1994 | 26.00 | -3.70% |
| 1995 | 23.00 | -11.54% |
| 1996 | 23.00 | 0.00% |
| 1997 | 18.00 | -21.74% |
| 1998 | 23.00 | 27.78% |
| 1999 | 28.00 | 21.74% |
| 2000 | 29.00 | 3.57% |
| 2001 | 31.00 | 6.90% |
| 2002 | 30.00 | -3.23% |
| 2003 | 29.00 | -3.33% |
| 2004 | 31.00 | 6.90% |
| 2005 | 32.00 | 3.23% |
| 2006 | 38.00 | 18.75% |
| 2007 | 35.00 | -7.89% |
| 2008 | 30.00 | -14.29% |
| 2009 | 20.00 | -33.33% |
| 2010 | 42.00 | 110.00% |
| 2011 | 41.00 | -2.38% |
| 2012 | 33.00 | -19.51% |
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