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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.20 | 6.67% |
| 1988 | 3.20 | 0.00% |
| 1989 | 3.40 | 6.25% |
| 1990 | 3.40 | 0.00% |
| 1991 | 3.50 | 2.94% |
| 1992 | 3.80 | 8.57% |
| 1993 | 3.70 | -2.63% |
| 1994 | 3.50 | -5.41% |
| 1995 | 3.70 | 5.71% |
| 1996 | 3.50 | -5.41% |
| 1997 | 3.80 | 8.57% |
| 1998 | 4.10 | 7.89% |
| 1999 | 4.20 | 2.44% |
| 2000 | 1.70 | -59.52% |
| 2001 | 2.00 | 17.65% |
| 2002 | 4.20 | 110.00% |
| 2003 | 5.10 | 21.43% |
| 2004 | 4.60 | -9.80% |
| 2005 | 4.90 | 6.52% |
| 2006 | 2.00 | -59.18% |
| 2007 | 2.50 | 25.00% |
| 2008 | 2.00 | -20.00% |
| 2009 | 3.60 | 80.00% |
| 2010 | 3.60 | 0.00% |
| 2011 | 3.60 | 0.00% |
| 2012 | 3.60 | 0.00% |
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