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| year | consumption | change |
| 1986 | 8.90 | NA |
| 1987 | 9.90 | 11.24% |
| 1988 | 12.00 | 21.21% |
| 1989 | 14.00 | 16.67% |
| 1990 | 13.00 | -7.14% |
| 1991 | 11.00 | -15.38% |
| 1992 | 11.00 | 0.00% |
| 1993 | 14.00 | 27.27% |
| 1994 | 16.00 | 14.29% |
| 1995 | 18.00 | 12.50% |
| 1996 | 20.00 | 11.11% |
| 1997 | 19.00 | -5.00% |
| 1998 | 26.00 | 36.84% |
| 1999 | 26.00 | 0.00% |
| 2000 | 29.00 | 11.54% |
| 2001 | 29.00 | 0.00% |
| 2002 | 44.00 | 51.72% |
| 2003 | 41.00 | -6.82% |
| 2004 | 39.00 | -4.88% |
| 2005 | 40.00 | 2.56% |
| 2006 | 37.00 | -7.50% |
| 2007 | 36.00 | -2.70% |
| 2008 | 31.00 | -13.89% |
| 2009 | 28.00 | -9.68% |
| 2010 | 39.00 | 39.29% |
| 2011 | 42.00 | 7.69% |
| 2012 | 44.00 | 4.76% |
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