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| year | consumption | change |
| 1986 | 10.00 | NA |
| 1987 | 11.00 | 10.00% |
| 1988 | 11.00 | 0.00% |
| 1989 | 13.00 | 18.18% |
| 1990 | 13.00 | 0.00% |
| 1991 | 12.00 | -7.69% |
| 1992 | 22.00 | 83.33% |
| 1993 | 22.00 | 0.00% |
| 1994 | 22.00 | 0.00% |
| 1995 | 22.00 | 0.00% |
| 1996 | 21.00 | -4.55% |
| 1997 | 22.00 | 4.76% |
| 1998 | 24.00 | 9.09% |
| 1999 | 19.00 | -20.83% |
| 2000 | 22.00 | 15.79% |
| 2001 | 26.00 | 18.18% |
| 2002 | 24.00 | -7.69% |
| 2003 | 27.00 | 12.50% |
| 2004 | 28.00 | 3.70% |
| 2005 | 29.00 | 3.57% |
| 2006 | 33.00 | 13.79% |
| 2007 | 32.00 | -3.03% |
| 2008 | 33.00 | 3.13% |
| 2009 | 36.00 | 9.09% |
| 2010 | 37.00 | 2.78% |
| 2011 | 33.00 | -10.81% |
| 2012 | 33.00 | 0.00% |
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