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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.00 | 0.00% |
| 1988 | 2.90 | -3.33% |
| 1989 | 3.10 | 6.90% |
| 1990 | 3.00 | -3.23% |
| 1991 | 1.60 | -46.67% |
| 1992 | 3.50 | 118.75% |
| 1993 | 5.60 | 60.00% |
| 1994 | 4.90 | -12.50% |
| 1995 | 5.50 | 12.24% |
| 1996 | 6.70 | 21.82% |
| 1997 | 4.50 | -32.84% |
| 1998 | 4.40 | -2.22% |
| 1999 | 4.30 | -2.27% |
| 2000 | 5.20 | 20.93% |
| 2001 | 5.00 | -3.85% |
| 2002 | 4.90 | -2.00% |
| 2003 | 6.50 | 32.65% |
| 2004 | 7.00 | 7.69% |
| 2005 | 5.30 | -24.29% |
| 2006 | 5.10 | -3.77% |
| 2007 | 3.30 | -35.29% |
| 2008 | 5.20 | 57.58% |
| 2009 | 6.30 | 21.15% |
| 2010 | 5.20 | -17.46% |
| 2011 | 6.30 | 21.15% |
| 2012 | 7.70 | 22.22% |
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