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| year | consumption | change |
| 1986 | 18.00 | NA |
| 1987 | 19.00 | 5.56% |
| 1988 | 21.00 | 10.53% |
| 1989 | 22.00 | 4.76% |
| 1990 | 25.00 | 13.64% |
| 1991 | 26.00 | 4.00% |
| 1992 | 28.00 | 7.69% |
| 1993 | 30.00 | 7.14% |
| 1994 | 33.00 | 10.00% |
| 1995 | 34.00 | 3.03% |
| 1996 | 37.00 | 8.82% |
| 1997 | 37.00 | 0.00% |
| 1998 | 35.00 | -5.41% |
| 1999 | 35.00 | 0.00% |
| 2000 | 33.00 | -5.71% |
| 2001 | 33.00 | 0.00% |
| 2002 | 32.00 | -3.03% |
| 2003 | 30.00 | -6.25% |
| 2004 | 30.00 | 0.00% |
| 2005 | 28.00 | -6.67% |
| 2006 | 27.00 | -3.57% |
| 2007 | 28.00 | 3.70% |
| 2008 | 27.00 | -3.57% |
| 2009 | 23.00 | -14.81% |
| 2010 | 23.00 | 0.00% |
| 2011 | 22.00 | -4.35% |
| 2012 | 19.00 | -13.64% |
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