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| year | consumption | change |
| 1986 | 6.60 | NA |
| 1987 | 6.60 | 0.00 % |
| 1988 | 3.40 | -48.48 % |
| 1989 | 3.60 | 5.88 % |
| 1990 | 2.40 | -33.33 % |
| 1991 | 1.30 | -45.83 % |
| 1992 | 1.00 | -23.08 % |
| 1993 | 1.30 | 30.00 % |
| 1994 | 1.60 | 23.08 % |
| 1995 | 1.60 | 0.00 % |
| 1996 | 1.40 | -12.50 % |
| 1997 | 1.20 | -14.29 % |
| 1998 | 1.20 | 0.00 % |
| 1999 | 1.30 | 8.33 % |
| 2000 | 1.50 | 15.38 % |
| 2001 | 1.10 | -26.67 % |
| 2002 | 1.20 | 9.09 % |
| 2003 | 1.20 | 0.00 % |
| 2004 | 1.60 | 33.33 % |
| 2005 | 1.90 | 18.75 % |
| 2006 | 3.10 | 63.16 % |
| 2007 | 3.80 | 22.58 % |
| 2008 | 1.80 | -52.63 % |
| 2009 | 1.70 | -5.56 % |
| 2010 | 1.40 | -17.65 % |
| 2011 | 1.00 | -28.57 % |
| 2012 | 1.20 | 20.00 % |
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