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| year | consumption | change |
| 1986 | 36.00 | NA |
| 1987 | 33.00 | -8.33% |
| 1988 | 33.00 | 0.00% |
| 1989 | 28.00 | -15.15% |
| 1990 | 28.00 | 0.00% |
| 1991 | 24.00 | -14.29% |
| 1992 | 22.00 | -8.33% |
| 1993 | 21.00 | -4.55% |
| 1994 | 29.00 | 38.10% |
| 1995 | 30.00 | 3.45% |
| 1996 | 33.00 | 10.00% |
| 1997 | 34.00 | 3.03% |
| 1998 | 34.00 | 0.00% |
| 1999 | 38.00 | 11.76% |
| 2000 | 41.00 | 7.89% |
| 2001 | 38.00 | -7.32% |
| 2002 | 35.00 | -7.89% |
| 2003 | 31.00 | -11.43% |
| 2004 | 38.00 | 22.58% |
| 2005 | 31.00 | -18.42% |
| 2006 | 34.00 | 9.68% |
| 2007 | 25.00 | -26.47% |
| 2008 | 25.00 | 0.00% |
| 2009 | 24.00 | -4.00% |
| 2010 | 18.00 | -25.00% |
| 2011 | 20.00 | 11.11% |
| 2012 | 16.00 | -20.00% |
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