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| year | consumption | change |
| 1986 | 6.90 | NA |
| 1987 | 5.80 | -15.94% |
| 1988 | 3.60 | -37.93% |
| 1989 | 4.10 | 13.89% |
| 1990 | 5.50 | 34.15% |
| 1991 | 8.50 | 54.55% |
| 1992 | 8.70 | 2.35% |
| 1993 | 8.40 | -3.45% |
| 1994 | 16.00 | 90.48% |
| 1995 | 15.00 | -6.25% |
| 1996 | 10.00 | -33.33% |
| 1997 | 12.00 | 20.00% |
| 1998 | 9.60 | -20.00% |
| 1999 | 13.00 | 35.42% |
| 2000 | 10.00 | -23.08% |
| 2001 | 8.00 | -20.00% |
| 2002 | 10.00 | 25.00% |
| 2003 | 8.00 | -20.00% |
| 2004 | 19.00 | 137.50% |
| 2005 | 20.00 | 5.26% |
| 2006 | 24.00 | 20.00% |
| 2007 | 27.00 | 12.50% |
| 2008 | 35.00 | 29.63% |
| 2009 | 21.00 | -40.00% |
| 2010 | 43.00 | 104.76% |
| 2011 | 44.00 | 2.33% |
| 2012 | 43.00 | -2.27% |
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