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| year | consumption | change |
| 1986 | 14.00 | NA |
| 1987 | 16.00 | 14.29% |
| 1988 | 15.00 | -6.25% |
| 1989 | 16.00 | 6.67% |
| 1990 | 14.00 | -12.50% |
| 1991 | 17.00 | 21.43% |
| 1992 | 21.00 | 23.53% |
| 1993 | 18.00 | -14.29% |
| 1994 | 20.00 | 11.11% |
| 1995 | 18.00 | -10.00% |
| 1996 | 19.00 | 5.56% |
| 1997 | 21.00 | 10.53% |
| 1998 | 21.00 | 0.00% |
| 1999 | 17.00 | -19.05% |
| 2000 | 18.00 | 5.88% |
| 2001 | 19.00 | 5.56% |
| 2002 | 16.00 | -15.79% |
| 2003 | 13.00 | -18.75% |
| 2004 | 11.00 | -15.38% |
| 2005 | 10.00 | -9.09% |
| 2006 | 11.00 | 10.00% |
| 2007 | 21.00 | 90.91% |
| 2008 | 20.00 | -4.76% |
| 2009 | 32.00 | 60.00% |
| 2010 | 33.00 | 3.13% |
| 2011 | 43.00 | 30.30% |
| 2012 | 43.00 | 0.00% |
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