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| year | consumption | change |
| 1986 | 5.40 | NA |
| 1987 | 5.40 | 0.00% |
| 1988 | 5.70 | 5.56% |
| 1989 | 5.80 | 1.75% |
| 1990 | 3.70 | -36.21% |
| 1991 | 3.90 | 5.41% |
| 1992 | 4.50 | 15.38% |
| 1993 | 3.90 | -13.33% |
| 1994 | 4.00 | 2.56% |
| 1995 | 4.00 | 0.00% |
| 1996 | 4.10 | 2.50% |
| 1997 | 4.10 | 0.00% |
| 1998 | 4.10 | 0.00% |
| 1999 | 4.20 | 2.44% |
| 2000 | 4.70 | 11.90% |
| 2001 | 4.90 | 4.26% |
| 2002 | 5.10 | 4.08% |
| 2003 | 5.30 | 3.92% |
| 2004 | 5.50 | 3.77% |
| 2005 | 5.30 | -3.64% |
| 2006 | 6.20 | 16.98% |
| 2007 | 6.40 | 3.23% |
| 2008 | 5.20 | -18.75% |
| 2009 | 5.50 | 5.77% |
| 2010 | 5.90 | 7.27% |
| 2011 | 7.70 | 30.51% |
| 2012 | 9.30 | 20.78% |
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