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| year | consumption | change |
| 1986 | 19.00 | NA |
| 1987 | 18.00 | -5.26% |
| 1988 | 18.00 | 0.00% |
| 1989 | 21.00 | 16.67% |
| 1990 | 24.00 | 14.29% |
| 1991 | 24.00 | 0.00% |
| 1992 | 24.00 | 0.00% |
| 1993 | 20.00 | -16.67% |
| 1994 | 20.00 | 0.00% |
| 1995 | 20.00 | 0.00% |
| 1996 | 16.00 | -20.00% |
| 1997 | 16.00 | 0.00% |
| 1998 | 17.00 | 6.25% |
| 1999 | 16.00 | -5.88% |
| 2000 | 16.00 | 0.00% |
| 2001 | 17.00 | 6.25% |
| 2002 | 16.00 | -5.88% |
| 2003 | 16.00 | 0.00% |
| 2004 | 47.00 | 193.75% |
| 2005 | 48.00 | 2.13% |
| 2006 | 52.00 | 8.33% |
| 2007 | 55.00 | 5.77% |
| 2008 | 58.00 | 5.45% |
| 2009 | 52.00 | -10.34% |
| 2010 | 61.00 | 17.31% |
| 2011 | 53.00 | -13.11% |
| 2012 | 55.00 | 3.77% |
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