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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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