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| year | consumption | change |
| 1986 | 46.00 | NA |
| 1987 | 48.00 | 4.35% |
| 1988 | 49.00 | 2.08% |
| 1989 | 51.00 | 4.08% |
| 1990 | 50.00 | -1.96% |
| 1991 | 44.00 | -12.00% |
| 1992 | 40.00 | -9.09% |
| 1993 | 39.00 | -2.50% |
| 1994 | 40.00 | 2.56% |
| 1995 | 36.00 | -10.00% |
| 1996 | 36.00 | 0.00% |
| 1997 | 34.00 | -5.56% |
| 1998 | 34.00 | 0.00% |
| 1999 | 35.00 | 2.94% |
| 2000 | 35.00 | 0.00% |
| 2001 | 33.00 | -5.71% |
| 2002 | 27.00 | -18.18% |
| 2003 | 32.00 | 18.52% |
| 2004 | 26.00 | -18.75% |
| 2005 | 25.00 | -3.85% |
| 2006 | 30.00 | 20.00% |
| 2007 | 35.00 | 16.67% |
| 2008 | 33.00 | -5.71% |
| 2009 | 26.00 | -21.21% |
| 2010 | 26.00 | 0.00% |
| 2011 | 25.00 | -3.85% |
| 2012 | 24.00 | -4.00% |
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