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| year | consumption | change |
| 1986 | 35.00 | NA |
| 1987 | 28.00 | -20.00% |
| 1988 | 27.00 | -3.57% |
| 1989 | 30.00 | 11.11% |
| 1990 | 39.00 | 30.00% |
| 1991 | 38.00 | -2.56% |
| 1992 | 41.00 | 7.89% |
| 1993 | 45.00 | 9.76% |
| 1994 | 48.00 | 6.67% |
| 1995 | 44.00 | -8.33% |
| 1996 | 42.00 | -4.55% |
| 1997 | 33.00 | -21.43% |
| 1998 | 33.00 | 0.00% |
| 1999 | 45.00 | 36.36% |
| 2000 | 35.00 | -22.22% |
| 2001 | 31.00 | -11.43% |
| 2002 | 24.00 | -22.58% |
| 2003 | 29.00 | 20.83% |
| 2004 | 28.00 | -3.45% |
| 2005 | 32.00 | 14.29% |
| 2006 | 38.00 | 18.75% |
| 2007 | 30.00 | -21.05% |
| 2008 | 39.00 | 30.00% |
| 2009 | 35.00 | -10.26% |
| 2010 | 49.00 | 40.00% |
| 2011 | 56.00 | 14.29% |
| 2012 | 56.00 | 0.00% |
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