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| year | consumption | change |
| 1986 | 3.20 | NA |
| 1987 | 3.30 | 3.13% |
| 1988 | 3.30 | 0.00% |
| 1989 | 3.40 | 3.03% |
| 1990 | 3.30 | -2.94% |
| 1991 | 3.50 | 6.06% |
| 1992 | 3.70 | 5.71% |
| 1993 | 3.70 | 0.00% |
| 1994 | 3.80 | 2.70% |
| 1995 | 3.80 | 0.00% |
| 1996 | 3.90 | 2.63% |
| 1997 | 3.80 | -2.56% |
| 1998 | 3.40 | -10.53% |
| 1999 | 3.30 | -2.94% |
| 2000 | 3.60 | 9.09% |
| 2001 | 4.20 | 16.67% |
| 2002 | 4.40 | 4.76% |
| 2003 | 4.40 | 0.00% |
| 2004 | 5.00 | 13.64% |
| 2005 | 5.00 | 0.00% |
| 2006 | 5.40 | 8.00% |
| 2007 | 5.60 | 3.70% |
| 2008 | 5.40 | -3.57% |
| 2009 | 5.30 | -1.85% |
| 2010 | 4.50 | -15.09% |
| 2011 | 4.40 | -2.22% |
| 2012 | 4.80 | 9.09% |
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