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| year | consumption | change |
| 1986 | 21.00 | NA |
| 1987 | 14.00 | -33.33% |
| 1988 | 21.00 | 50.00% |
| 1989 | 17.00 | -19.05% |
| 1990 | 20.00 | 17.65% |
| 1991 | 23.00 | 15.00% |
| 1992 | 23.00 | 0.00% |
| 1993 | 23.00 | 0.00% |
| 1994 | 22.00 | -4.35% |
| 1995 | 15.00 | -31.82% |
| 1996 | 15.00 | 0.00% |
| 1997 | 15.00 | 0.00% |
| 1998 | 16.00 | 6.67% |
| 1999 | 15.00 | -6.25% |
| 2000 | 14.00 | -6.67% |
| 2001 | 15.00 | 7.14% |
| 2002 | 15.00 | 0.00% |
| 2003 | 14.00 | -6.67% |
| 2004 | 15.00 | 7.14% |
| 2005 | 13.00 | -13.33% |
| 2006 | 15.00 | 15.38% |
| 2007 | 16.00 | 6.67% |
| 2008 | 12.00 | -25.00% |
| 2009 | 10.00 | -16.67% |
| 2010 | 7.80 | -22.00% |
| 2011 | 4.80 | -38.46% |
| 2012 | 5.50 | 14.58% |
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