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| year | consumption | change |
| 1986 | 1.50 | NA |
| 1987 | 1.10 | -26.67% |
| 1988 | 1.40 | 27.27% |
| 1989 | 1.50 | 7.14% |
| 1990 | 2.10 | 40.00% |
| 1991 | 2.40 | 14.29% |
| 1992 | 2.50 | 4.17% |
| 1993 | 3.10 | 24.00% |
| 1994 | 3.40 | 9.68% |
| 1995 | 3.70 | 8.82% |
| 1996 | 4.10 | 10.81% |
| 1997 | 4.10 | 0.00% |
| 1998 | 4.60 | 12.20% |
| 1999 | 1.60 | -65.22% |
| 2000 | 5.20 | 225.00% |
| 2001 | 5.30 | 1.92% |
| 2002 | 5.70 | 7.55% |
| 2003 | 5.30 | -7.02% |
| 2004 | 7.60 | 43.40% |
| 2005 | 8.80 | 15.79% |
| 2006 | 9.80 | 11.36% |
| 2007 | 9.10 | -7.14% |
| 2008 | 9.50 | 4.40% |
| 2009 | 13.00 | 36.84% |
| 2010 | 14.00 | 7.69% |
| 2011 | 13.00 | -7.14% |
| 2012 | 13.00 | 0.00% |
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