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| year | consumption | change |
| 1986 | 1.60 | NA |
| 1987 | 2.50 | 56.25 % |
| 1988 | 2.20 | -12.00 % |
| 1989 | 2.20 | 0.00 % |
| 1990 | 2.50 | 13.64 % |
| 1991 | 3.00 | 20.00 % |
| 1992 | 4.50 | 50.00 % |
| 1993 | 3.60 | -20.00 % |
| 1994 | 3.20 | -11.11 % |
| 1995 | 3.50 | 9.38 % |
| 1996 | 5.10 | 45.71 % |
| 1997 | 4.70 | -7.84 % |
| 1998 | 4.50 | -4.26 % |
| 1999 | 3.50 | -22.22 % |
| 2000 | 2.60 | -25.71 % |
| 2001 | 3.00 | 15.38 % |
| 2002 | 3.00 | 0.00 % |
| 2003 | 2.60 | -13.33 % |
| 2004 | 2.70 | 3.85 % |
| 2005 | 1.90 | -29.63 % |
| 2006 | 1.60 | -15.79 % |
| 2007 | 1.40 | -12.50 % |
| 2008 | 1.70 | 21.43 % |
| 2009 | 2.30 | 35.29 % |
| 2010 | 1.70 | -26.09 % |
| 2011 | 1.30 | -23.53 % |
| 2012 | 1.40 | 7.69 % |
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