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| year | consumption | change |
| 1986 | 3.40 | NA |
| 1987 | 3.40 | 0.00% |
| 1988 | 3.40 | 0.00% |
| 1989 | 3.50 | 2.94% |
| 1990 | 3.60 | 2.86% |
| 1991 | 3.60 | 0.00% |
| 1992 | 4.00 | 11.11% |
| 1993 | 4.20 | 5.00% |
| 1994 | 4.30 | 2.38% |
| 1995 | 4.80 | 11.63% |
| 1996 | 4.80 | 0.00% |
| 1997 | 4.50 | -6.25% |
| 1998 | 4.40 | -2.22% |
| 1999 | 4.00 | -9.09% |
| 2000 | 4.80 | 20.00% |
| 2001 | 4.70 | -2.08% |
| 2002 | 4.80 | 2.13% |
| 2003 | 4.20 | -12.50% |
| 2004 | 3.90 | -7.14% |
| 2005 | 4.40 | 12.82% |
| 2006 | 3.50 | -20.45% |
| 2007 | 3.60 | 2.86% |
| 2008 | 3.20 | -11.11% |
| 2009 | 2.80 | -12.50% |
| 2010 | 3.50 | 25.00% |
| 2011 | 2.00 | -42.86% |
| 2012 | 2.80 | 40.00% |
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