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| year | consumption | change |
| 1986 | 1.10 | NA |
| 1987 | 1.40 | 27.27% |
| 1988 | 1.60 | 14.29% |
| 1989 | 1.70 | 6.25% |
| 1990 | 2.20 | 29.41% |
| 1991 | 1.80 | -18.18% |
| 1992 | 2.40 | 33.33% |
| 1993 | 2.80 | 16.67% |
| 1994 | 2.70 | -3.57% |
| 1995 | 3.10 | 14.81% |
| 1996 | 4.60 | 48.39% |
| 1997 | 5.20 | 13.04% |
| 1998 | 6.60 | 26.92% |
| 1999 | 6.40 | -3.03% |
| 2000 | 6.30 | -1.56% |
| 2001 | 6.20 | -1.59% |
| 2002 | 6.00 | -3.23% |
| 2003 | 6.70 | 11.67% |
| 2004 | 6.30 | -5.97% |
| 2005 | 6.80 | 7.94% |
| 2006 | 7.20 | 5.88% |
| 2007 | 7.70 | 6.94% |
| 2008 | 8.10 | 5.19% |
| 2009 | 8.60 | 6.17% |
| 2010 | 5.60 | -34.88% |
| 2011 | 6.20 | 10.71% |
| 2012 | 6.50 | 4.84% |
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