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| year | consumption | change |
| 1986 | 11.00 | NA |
| 1987 | 12.00 | 9.09% |
| 1988 | 12.00 | 0.00% |
| 1989 | 14.00 | 16.67% |
| 1990 | 14.00 | 0.00% |
| 1991 | 14.00 | 0.00% |
| 1992 | 16.00 | 14.29% |
| 1993 | 17.00 | 6.25% |
| 1994 | 18.00 | 5.88% |
| 1995 | 14.00 | -22.22% |
| 1996 | 21.00 | 50.00% |
| 1997 | 22.00 | 4.76% |
| 1998 | 17.00 | -22.73% |
| 1999 | 21.00 | 23.53% |
| 2000 | 25.00 | 19.05% |
| 2001 | 24.00 | -4.00% |
| 2002 | 24.00 | 0.00% |
| 2003 | 21.00 | -12.50% |
| 2004 | 19.00 | -9.52% |
| 2005 | 21.00 | 10.53% |
| 2006 | 22.00 | 4.76% |
| 2007 | 22.00 | 0.00% |
| 2008 | 22.00 | 0.00% |
| 2009 | 21.00 | -4.55% |
| 2010 | 19.00 | -9.52% |
| 2011 | 17.00 | -10.53% |
| 2012 | 18.00 | 5.88% |
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