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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.00 | 0.00% |
| 1988 | 3.10 | 3.33% |
| 1989 | 3.00 | -3.23% |
| 1990 | 2.80 | -6.67% |
| 1991 | 2.50 | -10.71% |
| 1992 | 2.60 | 4.00% |
| 1993 | 2.70 | 3.85% |
| 1994 | 2.90 | 7.41% |
| 1995 | 2.30 | -20.69% |
| 1996 | 2.80 | 21.74% |
| 1997 | 2.50 | -10.71% |
| 1998 | 3.10 | 24.00% |
| 1999 | 3.40 | 9.68% |
| 2000 | 3.60 | 5.88% |
| 2001 | 3.80 | 5.56% |
| 2002 | 4.10 | 7.89% |
| 2003 | 3.90 | -4.88% |
| 2004 | 4.20 | 7.69% |
| 2005 | 4.50 | 7.14% |
| 2006 | 4.40 | -2.22% |
| 2007 | 4.70 | 6.82% |
| 2008 | 4.60 | -2.13% |
| 2009 | 5.20 | 13.04% |
| 2010 | 5.40 | 3.85% |
| 2011 | 5.20 | -3.70% |
| 2012 | 5.70 | 9.62% |
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