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| year | consumption | change |
| 1986 | 2.20 | NA |
| 1987 | 2.80 | 27.27% |
| 1988 | 2.50 | -10.71% |
| 1989 | 3.20 | 28.00% |
| 1990 | 3.00 | -6.25% |
| 1991 | 2.90 | -3.33% |
| 1992 | 3.20 | 10.34% |
| 1993 | 4.30 | 34.38% |
| 1994 | 5.50 | 27.91% |
| 1995 | 4.50 | -18.18% |
| 1996 | 4.30 | -4.44% |
| 1997 | 4.00 | -6.98% |
| 1998 | 4.70 | 17.50% |
| 1999 | 5.00 | 6.38% |
| 2000 | 5.00 | 0.00% |
| 2001 | 4.00 | -20.00% |
| 2002 | 3.60 | -10.00% |
| 2003 | 3.90 | 8.33% |
| 2004 | 3.40 | -12.82% |
| 2005 | 3.90 | 14.71% |
| 2006 | 4.20 | 7.69% |
| 2007 | 4.20 | 0.00% |
| 2008 | 5.00 | 19.05% |
| 2009 | 5.60 | 12.00% |
| 2010 | 7.30 | 30.36% |
| 2011 | 8.20 | 12.33% |
| 2012 | 8.50 | 3.66% |
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