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| year | consumption | change |
| 1986 | 8.60 | NA |
| 1987 | 7.30 | -15.12% |
| 1988 | 9.40 | 28.77% |
| 1989 | 14.00 | 48.94% |
| 1990 | 17.00 | 21.43% |
| 1991 | 23.00 | 35.29% |
| 1992 | 11.00 | -52.17% |
| 1993 | 10.00 | -9.09% |
| 1994 | 12.00 | 20.00% |
| 1995 | 9.50 | -20.83% |
| 1996 | 8.80 | -7.37% |
| 1997 | 6.60 | -25.00% |
| 1998 | 11.00 | 66.67% |
| 1999 | 9.40 | -14.55% |
| 2000 | 9.00 | -4.26% |
| 2001 | 8.50 | -5.56% |
| 2002 | 9.20 | 8.24% |
| 2003 | 8.70 | -5.43% |
| 2004 | 10.00 | 14.94% |
| 2005 | 10.00 | 0.00% |
| 2006 | 9.80 | -2.00% |
| 2007 | 5.40 | -44.90% |
| 2008 | 5.00 | -7.41% |
| 2009 | 11.00 | 120.00% |
| 2010 | 14.00 | 27.27% |
| 2011 | 6.30 | -55.00% |
| 2012 | 5.50 | -12.70% |
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