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| year | consumption | change |
| 1986 | 14.00 | NA |
| 1987 | 15.00 | 7.14% |
| 1988 | 16.00 | 6.67% |
| 1989 | 17.00 | 6.25% |
| 1990 | 18.00 | 5.88% |
| 1991 | 19.00 | 5.56% |
| 1992 | 21.00 | 10.53% |
| 1993 | 23.00 | 9.52% |
| 1994 | 24.00 | 4.35% |
| 1995 | 26.00 | 8.33% |
| 1996 | 29.00 | 11.54% |
| 1997 | 30.00 | 3.45% |
| 1998 | 32.00 | 6.67% |
| 1999 | 33.00 | 3.13% |
| 2000 | 33.00 | 0.00% |
| 2001 | 32.00 | -3.03% |
| 2002 | 31.00 | -3.13% |
| 2003 | 32.00 | 3.23% |
| 2004 | 32.00 | 0.00% |
| 2005 | 31.00 | -3.13% |
| 2006 | 31.00 | 0.00% |
| 2007 | 41.00 | 32.26% |
| 2008 | 42.00 | 2.44% |
| 2009 | 47.00 | 11.90% |
| 2010 | 40.00 | -14.89% |
| 2011 | 41.00 | 2.50% |
| 2012 | 41.00 | 0.00% |
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