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| year | consumption | change |
| 1986 | 24.00 | NA |
| 1987 | 15.00 | -37.50% |
| 1988 | 15.00 | 0.00% |
| 1989 | 17.00 | 13.33% |
| 1990 | 17.00 | 0.00% |
| 1991 | 17.00 | 0.00% |
| 1992 | 17.00 | 0.00% |
| 1993 | 17.00 | 0.00% |
| 1994 | 20.00 | 17.65% |
| 1995 | 21.00 | 5.00% |
| 1996 | 23.00 | 9.52% |
| 1997 | 23.00 | 0.00% |
| 1998 | 23.00 | 0.00% |
| 1999 | 23.00 | 0.00% |
| 2000 | 23.00 | 0.00% |
| 2001 | 24.00 | 4.35% |
| 2002 | 27.00 | 12.50% |
| 2003 | 30.00 | 11.11% |
| 2004 | 36.00 | 20.00% |
| 2005 | 42.00 | 16.67% |
| 2006 | 38.00 | -9.52% |
| 2007 | 37.00 | -2.63% |
| 2008 | 31.00 | -16.22% |
| 2009 | 33.00 | 6.45% |
| 2010 | 32.00 | -3.03% |
| 2011 | 45.00 | 40.63% |
| 2012 | 52.00 | 15.56% |
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