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| year | consumption | change |
| 1986 | 4.60 | NA |
| 1987 | 5.40 | 17.39% |
| 1988 | 5.20 | -3.70% |
| 1989 | 5.80 | 11.54% |
| 1990 | 6.80 | 17.24% |
| 1991 | 6.30 | -7.35% |
| 1992 | 6.80 | 7.94% |
| 1993 | 6.60 | -2.94% |
| 1994 | 6.90 | 4.55% |
| 1995 | 7.00 | 1.45% |
| 1996 | 8.20 | 17.14% |
| 1997 | 11.00 | 34.15% |
| 1998 | 9.80 | -10.91% |
| 1999 | 9.80 | 0.00% |
| 2000 | 8.20 | -16.33% |
| 2001 | 7.50 | -8.54% |
| 2002 | 7.10 | -5.33% |
| 2003 | 6.40 | -9.86% |
| 2004 | 5.00 | -21.88% |
| 2005 | 4.00 | -20.00% |
| 2006 | 3.80 | -5.00% |
| 2007 | 3.60 | -5.26% |
| 2008 | 3.40 | -5.56% |
| 2009 | 3.30 | -2.94% |
| 2010 | 3.60 | 9.09% |
| 2011 | 3.90 | 8.33% |
| 2012 | 4.10 | 5.13% |
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