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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.00 | 0.00% |
| 1988 | 2.90 | -3.33% |
| 1989 | 3.10 | 6.90% |
| 1990 | 5.10 | 64.52% |
| 1991 | 4.90 | -3.92% |
| 1992 | 4.90 | 0.00% |
| 1993 | 5.00 | 2.04% |
| 1994 | 6.10 | 22.00% |
| 1995 | 6.40 | 4.92% |
| 1996 | 6.70 | 4.69% |
| 1997 | 4.60 | -31.34% |
| 1998 | 4.50 | -2.17% |
| 1999 | 4.20 | -6.67% |
| 2000 | 4.40 | 4.76% |
| 2001 | 4.20 | -4.55% |
| 2002 | 4.10 | -2.38% |
| 2003 | 4.70 | 14.63% |
| 2004 | 4.40 | -6.38% |
| 2005 | 4.50 | 2.27% |
| 2006 | 4.40 | -2.22% |
| 2007 | 4.60 | 4.55% |
| 2008 | 4.90 | 6.52% |
| 2009 | 4.70 | -4.08% |
| 2010 | 4.30 | -8.51% |
| 2011 | 4.50 | 4.65% |
| 2012 | 4.80 | 6.67% |
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