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| year | consumption | change |
| 1986 | 3.30 | NA |
| 1987 | 3.60 | 9.09% |
| 1988 | 2.70 | -25.00% |
| 1989 | 2.20 | -18.52% |
| 1990 | 1.90 | -13.64% |
| 1991 | 2.30 | 21.05% |
| 1992 | 1.80 | -21.74% |
| 1993 | 2.10 | 16.67% |
| 1994 | 1.90 | -9.52% |
| 1995 | 1.80 | -5.26% |
| 1996 | 2.20 | 22.22% |
| 1997 | 2.50 | 13.64% |
| 1998 | 2.70 | 8.00% |
| 1999 | 1.90 | -29.63% |
| 2000 | 1.80 | -5.26% |
| 2001 | 1.70 | -5.56% |
| 2002 | 1.50 | -11.76% |
| 2003 | 1.60 | 6.67% |
| 2004 | 1.40 | -12.50% |
| 2005 | 1.40 | 0.00% |
| 2006 | 1.20 | -14.29% |
| 2007 | 1.90 | 58.33% |
| 2008 | 1.90 | 0.00% |
| 2009 | 2.30 | 21.05% |
| 2010 | 2.20 | -4.35% |
| 2011 | 1.60 | -27.27% |
| 2012 | 3.70 | 131.25% |
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