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| year | consumption | change |
| 1986 | 4.60 | NA |
| 1987 | 4.60 | 0.00% |
| 1988 | 3.10 | -32.61% |
| 1989 | 3.50 | 12.90% |
| 1990 | 3.40 | -2.86% |
| 1991 | 3.10 | -8.82% |
| 1992 | 3.50 | 12.90% |
| 1993 | 4.00 | 14.29% |
| 1994 | 4.50 | 12.50% |
| 1995 | 4.90 | 8.89% |
| 1996 | 4.20 | -14.29% |
| 1997 | 6.00 | 42.86% |
| 1998 | 7.20 | 20.00% |
| 1999 | 7.20 | 0.00% |
| 2000 | 8.00 | 11.11% |
| 2001 | 7.40 | -7.50% |
| 2002 | 7.90 | 6.76% |
| 2003 | 8.90 | 12.66% |
| 2004 | 9.20 | 3.37% |
| 2005 | 9.40 | 2.17% |
| 2006 | 8.80 | -6.38% |
| 2007 | 8.60 | -2.27% |
| 2008 | 8.60 | 0.00% |
| 2009 | 8.90 | 3.49% |
| 2010 | 12.00 | 34.83% |
| 2011 | 8.80 | -26.67% |
| 2012 | 13.00 | 47.73% |
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