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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 1.40 | -53.33% |
| 1988 | 3.30 | 135.71% |
| 1989 | 3.30 | 0.00% |
| 1990 | 3.20 | -3.03% |
| 1991 | 3.10 | -3.13% |
| 1992 | 3.30 | 6.45% |
| 1993 | 3.70 | 12.12% |
| 1994 | 3.70 | 0.00% |
| 1995 | 4.60 | 24.32% |
| 1996 | 4.50 | -2.17% |
| 1997 | 4.60 | 2.22% |
| 1998 | 4.60 | 0.00% |
| 1999 | 4.60 | 0.00% |
| 2000 | 6.00 | 30.43% |
| 2001 | 7.50 | 25.00% |
| 2002 | 7.10 | -5.33% |
| 2003 | 6.30 | -11.27% |
| 2004 | 6.50 | 3.17% |
| 2005 | 6.40 | -1.54% |
| 2006 | 6.70 | 4.69% |
| 2007 | 6.60 | -1.49% |
| 2008 | 6.50 | -1.52% |
| 2009 | 5.50 | -15.38% |
| 2010 | 6.70 | 21.82% |
| 2011 | 6.40 | -4.48% |
| 2012 | 6.50 | 1.56% |
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