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| year | consumption | change |
| 1986 | 4.10 | NA |
| 1987 | 4.40 | 7.32% |
| 1988 | 4.20 | -4.55% |
| 1989 | 4.50 | 7.14% |
| 1990 | 4.30 | -4.44% |
| 1991 | 4.30 | 0.00% |
| 1992 | 4.20 | -2.33% |
| 1993 | 4.30 | 2.38% |
| 1994 | 4.40 | 2.33% |
| 1995 | 4.30 | -2.27% |
| 1996 | 4.10 | -4.65% |
| 1997 | 4.00 | -2.44% |
| 1998 | 4.20 | 5.00% |
| 1999 | 4.30 | 2.38% |
| 2000 | 4.50 | 4.65% |
| 2001 | 4.60 | 2.22% |
| 2002 | 4.40 | -4.35% |
| 2003 | 4.30 | -2.27% |
| 2004 | 4.50 | 4.65% |
| 2005 | 4.80 | 6.67% |
| 2006 | 5.50 | 14.58% |
| 2007 | 4.50 | -18.18% |
| 2008 | 4.70 | 4.44% |
| 2009 | 3.30 | -29.79% |
| 2010 | 4.20 | 27.27% |
| 2011 | 3.30 | -21.43% |
| 2012 | 2.60 | -21.21% |
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