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| year | consumption | change |
| 1986 | 7.70 | NA |
| 1987 | 9.10 | 18.18% |
| 1988 | 9.80 | 7.69% |
| 1989 | 8.60 | -12.24% |
| 1990 | 11.00 | 27.91% |
| 1991 | 8.50 | -22.73% |
| 1992 | 12.00 | 41.18% |
| 1993 | 15.00 | 25.00% |
| 1994 | 15.00 | 0.00% |
| 1995 | 12.00 | -20.00% |
| 1996 | 17.00 | 41.67% |
| 1997 | 14.00 | -17.65% |
| 1998 | 18.00 | 28.57% |
| 1999 | 19.00 | 5.56% |
| 2000 | 17.00 | -10.53% |
| 2001 | 15.00 | -11.76% |
| 2002 | 15.00 | 0.00% |
| 2003 | 15.00 | 0.00% |
| 2004 | 15.00 | 0.00% |
| 2005 | 16.00 | 6.67% |
| 2006 | 19.00 | 18.75% |
| 2007 | 20.00 | 5.26% |
| 2008 | 29.00 | 45.00% |
| 2009 | 25.00 | -13.79% |
| 2010 | 22.00 | -12.00% |
| 2011 | 27.00 | 22.73% |
| 2012 | 28.00 | 3.70% |
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