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| year | consumption | change |
| 1986 | 1.80 | NA |
| 1987 | 1.80 | 0.00% |
| 1988 | 1.60 | -11.11% |
| 1989 | 1.60 | 0.00% |
| 1990 | 1.70 | 6.25% |
| 1991 | 1.60 | -5.88% |
| 1992 | 1.70 | 6.25% |
| 1993 | 1.80 | 5.88% |
| 1994 | 1.60 | -11.11% |
| 1995 | 1.70 | 6.25% |
| 1996 | 1.70 | 0.00% |
| 1997 | 1.50 | -11.76% |
| 1998 | 2.50 | 66.67% |
| 1999 | 3.80 | 52.00% |
| 2000 | 3.20 | -15.79% |
| 2001 | 3.50 | 9.38% |
| 2002 | 4.20 | 20.00% |
| 2003 | 3.00 | -28.57% |
| 2004 | 7.00 | 133.33% |
| 2005 | 7.10 | 1.43% |
| 2006 | 11.00 | 54.93% |
| 2007 | 11.00 | 0.00% |
| 2008 | 14.00 | 27.27% |
| 2009 | 18.00 | 28.57% |
| 2010 | 24.00 | 33.33% |
| 2011 | 25.00 | 4.17% |
| 2012 | 25.00 | 0.00% |
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