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| year | consumption | change |
| 1986 | 5.90 | NA |
| 1987 | 4.60 | -22.03% |
| 1988 | 4.50 | -2.17% |
| 1989 | 6.30 | 40.00% |
| 1990 | 3.90 | -38.10% |
| 1991 | 4.80 | 23.08% |
| 1992 | 6.40 | 33.33% |
| 1993 | 4.70 | -26.56% |
| 1994 | 14.00 | 197.87% |
| 1995 | 6.70 | -52.14% |
| 1996 | 3.30 | -50.75% |
| 1997 | 6.10 | 84.85% |
| 1998 | 2.50 | -59.02% |
| 1999 | 3.10 | 24.00% |
| 2000 | 2.90 | -6.45% |
| 2001 | 4.30 | 48.28% |
| 2002 | 2.70 | -37.21% |
| 2003 | 2.50 | -7.41% |
| 2004 | 2.60 | 4.00% |
| 2005 | 2.60 | 0.00% |
| 2006 | 2.70 | 3.85% |
| 2007 | 2.80 | 3.70% |
| 2008 | 3.10 | 10.71% |
| 2009 | 3.40 | 9.68% |
| 2010 | 3.90 | 14.71% |
| 2011 | 4.20 | 7.69% |
| 2012 | 4.60 | 9.52% |
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