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| year | consumption | change |
| 1986 | 5.30 | NA |
| 1987 | 5.10 | -3.77% |
| 1988 | 5.40 | 5.88% |
| 1989 | 3.00 | -44.44% |
| 1990 | 3.20 | 6.67% |
| 1991 | 7.30 | 128.13% |
| 1992 | 7.80 | 6.85% |
| 1993 | 5.10 | -34.62% |
| 1994 | 5.80 | 13.73% |
| 1995 | 5.80 | 0.00% |
| 1996 | 6.70 | 15.52% |
| 1997 | 5.40 | -19.40% |
| 1998 | 5.00 | -7.41% |
| 1999 | 6.40 | 28.00% |
| 2000 | 5.70 | -10.94% |
| 2001 | 7.00 | 22.81% |
| 2002 | 7.10 | 1.43% |
| 2003 | 7.40 | 4.23% |
| 2004 | 7.80 | 5.41% |
| 2005 | 8.10 | 3.85% |
| 2006 | 8.80 | 8.64% |
| 2007 | 8.80 | 0.00% |
| 2008 | 9.00 | 2.27% |
| 2009 | 9.70 | 7.78% |
| 2010 | 6.50 | -32.99% |
| 2011 | 11.00 | 69.23% |
| 2012 | 18.00 | 63.64% |
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