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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 7.50 | 47.06% |
| 1988 | 9.60 | 28.00% |
| 1989 | 8.50 | -11.46% |
| 1990 | 5.80 | -31.76% |
| 1991 | 3.60 | -37.93% |
| 1992 | 3.10 | -13.89% |
| 1993 | 3.60 | 16.13% |
| 1994 | 3.20 | -11.11% |
| 1995 | 3.30 | 3.13% |
| 1996 | 3.60 | 9.09% |
| 1997 | 3.80 | 5.56% |
| 1998 | 3.80 | 0.00% |
| 1999 | 3.90 | 2.63% |
| 2000 | 3.90 | 0.00% |
| 2001 | 2.80 | -28.21% |
| 2002 | 3.80 | 35.71% |
| 2003 | 1.80 | -52.63% |
| 2004 | 2.60 | 44.44% |
| 2005 | 4.20 | 61.54% |
| 2006 | 3.20 | -23.81% |
| 2007 | 2.50 | -21.88% |
| 2008 | 3.10 | 24.00% |
| 2009 | 2.90 | -6.45% |
| 2010 | 3.80 | 31.03% |
| 2011 | 3.20 | -15.79% |
| 2012 | 3.30 | 3.13% |
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