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| year | consumption | change |
| 1986 | 2.80 | NA |
| 1987 | 2.80 | 0.00% |
| 1988 | 3.00 | 7.14% |
| 1989 | 3.00 | 0.00% |
| 1990 | 3.10 | 3.33% |
| 1991 | 2.90 | -6.45% |
| 1992 | 3.70 | 27.59% |
| 1993 | 3.30 | -10.81% |
| 1994 | 4.40 | 33.33% |
| 1995 | 3.30 | -25.00% |
| 1996 | 4.80 | 45.45% |
| 1997 | 4.90 | 2.08% |
| 1998 | 5.40 | 10.20% |
| 1999 | 5.70 | 5.56% |
| 2000 | 6.50 | 14.04% |
| 2001 | 6.70 | 3.08% |
| 2002 | 6.70 | 0.00% |
| 2003 | 7.00 | 4.48% |
| 2004 | 7.40 | 5.71% |
| 2005 | 7.90 | 6.76% |
| 2006 | 7.90 | 0.00% |
| 2007 | 7.80 | -1.27% |
| 2008 | 8.00 | 2.56% |
| 2009 | 7.40 | -7.50% |
| 2010 | 7.70 | 4.05% |
| 2011 | 8.20 | 6.49% |
| 2012 | 8.80 | 7.32% |
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