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| year | consumption | change |
| 1986 | 4.50 | NA |
| 1987 | 3.60 | -20.00% |
| 1988 | 3.60 | 0.00% |
| 1989 | 2.20 | -38.89% |
| 1990 | 2.20 | 0.00% |
| 1991 | 2.40 | 9.09% |
| 1992 | 1.50 | -37.50% |
| 1993 | 3.40 | 126.67% |
| 1994 | 3.30 | -2.94% |
| 1995 | 1.70 | -48.48% |
| 1996 | 1.70 | 0.00% |
| 1997 | 1.80 | 5.88% |
| 1998 | 2.20 | 22.22% |
| 1999 | 3.00 | 36.36% |
| 2000 | 2.60 | -13.33% |
| 2001 | 2.80 | 7.69% |
| 2002 | 2.80 | 0.00% |
| 2003 | 2.50 | -10.71% |
| 2004 | 1.70 | -32.00% |
| 2005 | 2.40 | 41.18% |
| 2006 | 1.70 | -29.17% |
| 2007 | 1.70 | 0.00% |
| 2008 | 1.80 | 5.88% |
| 2009 | 2.50 | 38.89% |
| 2010 | 2.50 | 0.00% |
| 2011 | 2.50 | 0.00% |
| 2012 | 2.50 | 0.00% |
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