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| year | consumption | change |
| 1986 | 12.00 | NA |
| 1987 | 12.00 | 0.00% |
| 1988 | 12.00 | 0.00% |
| 1989 | 13.00 | 8.33% |
| 1990 | 15.00 | 15.38% |
| 1991 | 19.00 | 26.67% |
| 1992 | 20.00 | 5.26% |
| 1993 | 20.00 | 0.00% |
| 1994 | 19.00 | -5.00% |
| 1995 | 18.00 | -5.26% |
| 1996 | 20.00 | 11.11% |
| 1997 | 21.00 | 5.00% |
| 1998 | 22.00 | 4.76% |
| 1999 | 24.00 | 9.09% |
| 2000 | 26.00 | 8.33% |
| 2001 | 29.00 | 11.54% |
| 2002 | 30.00 | 3.45% |
| 2003 | 33.00 | 10.00% |
| 2004 | 40.00 | 21.21% |
| 2005 | 43.00 | 7.50% |
| 2006 | 42.00 | -2.33% |
| 2007 | 41.00 | -2.38% |
| 2008 | 42.00 | 2.44% |
| 2009 | 39.00 | -7.14% |
| 2010 | 42.00 | 7.69% |
| 2011 | 43.00 | 2.38% |
| 2012 | 42.00 | -2.33% |
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