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| year | consumption | change |
| 1986 | 31.00 | NA |
| 1987 | 34.00 | 9.68% |
| 1988 | 38.00 | 11.76% |
| 1989 | 31.00 | -18.42% |
| 1990 | 33.00 | 6.45% |
| 1991 | 37.00 | 12.12% |
| 1992 | 32.00 | -13.51% |
| 1993 | 36.00 | 12.50% |
| 1994 | 35.00 | -2.78% |
| 1995 | 37.00 | 5.71% |
| 1996 | 37.00 | 0.00% |
| 1997 | 22.00 | -40.54% |
| 1998 | 22.00 | 0.00% |
| 1999 | 20.00 | -9.09% |
| 2000 | 27.00 | 35.00% |
| 2001 | 35.00 | 29.63% |
| 2002 | 33.00 | -5.71% |
| 2003 | 24.00 | -27.27% |
| 2004 | 20.00 | -16.67% |
| 2005 | 28.00 | 40.00% |
| 2006 | 37.00 | 32.14% |
| 2007 | 37.00 | 0.00% |
| 2008 | 17.00 | -54.05% |
| 2009 | 12.00 | -29.41% |
| 2010 | 44.00 | 266.67% |
| 2011 | 44.00 | 0.00% |
| 2012 | 53.00 | 20.45% |
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