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| year | consumption | change |
| 1986 | 3.50 | NA |
| 1987 | 3.60 | 2.86% |
| 1988 | 3.60 | 0.00% |
| 1989 | 3.80 | 5.56% |
| 1990 | 3.30 | -13.16% |
| 1991 | 5.00 | 51.52% |
| 1992 | 3.20 | -36.00% |
| 1993 | 3.20 | 0.00% |
| 1994 | 3.80 | 18.75% |
| 1995 | 3.90 | 2.63% |
| 1996 | 4.40 | 12.82% |
| 1997 | 4.50 | 2.27% |
| 1998 | 4.50 | 0.00% |
| 1999 | 4.50 | 0.00% |
| 2000 | 4.80 | 6.67% |
| 2001 | 4.50 | -6.25% |
| 2002 | 4.60 | 2.22% |
| 2003 | 4.70 | 2.17% |
| 2004 | 4.70 | 0.00% |
| 2005 | 4.50 | -4.26% |
| 2006 | 4.70 | 4.44% |
| 2007 | 5.00 | 6.38% |
| 2008 | 5.10 | 2.00% |
| 2009 | 5.10 | 0.00% |
| 2010 | 5.40 | 5.88% |
| 2011 | 5.70 | 5.56% |
| 2012 | 6.10 | 7.02% |
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