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| year | consumption | change |
| 1986 | 44.00 | NA |
| 1987 | 45.00 | 2.27% |
| 1988 | 35.00 | -22.22% |
| 1989 | 32.00 | -8.57% |
| 1990 | 30.00 | -6.25% |
| 1991 | 37.00 | 23.33% |
| 1992 | 42.00 | 13.51% |
| 1993 | 46.00 | 9.52% |
| 1994 | 46.00 | 0.00% |
| 1995 | 44.00 | -4.35% |
| 1996 | 40.00 | -9.09% |
| 1997 | 40.00 | 0.00% |
| 1998 | 40.00 | 0.00% |
| 1999 | 36.00 | -10.00% |
| 2000 | 27.00 | -25.00% |
| 2001 | 23.00 | -14.81% |
| 2002 | 13.00 | -43.48% |
| 2003 | 12.00 | -7.69% |
| 2004 | 8.20 | -31.67% |
| 2005 | 4.30 | -47.56% |
| 2006 | 4.10 | -4.65% |
| 2007 | 3.90 | -4.88% |
| 2008 | 3.30 | -15.38% |
| 2009 | 4.00 | 21.21% |
| 2010 | 2.40 | -40.00% |
| 2011 | 1.90 | -20.83% |
| 2012 | 1.50 | -21.05% |
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