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| year | consumption | change |
| 1986 | 2.00 | NA |
| 1987 | 1.90 | -5.00% |
| 1988 | 1.90 | 0.00% |
| 1989 | 2.00 | 5.26% |
| 1990 | 1.90 | -5.00% |
| 1991 | 1.20 | -36.84% |
| 1992 | 1.00 | -16.67% |
| 1993 | 1.00 | 0.00% |
| 1994 | 1.00 | 0.00% |
| 1995 | 1.00 | 0.00% |
| 1996 | 1.00 | 0.00% |
| 1997 | 1.00 | 0.00% |
| 1998 | 1.00 | 0.00% |
| 1999 | 1.00 | 0.00% |
| 2000 | 1.00 | 0.00% |
| 2001 | 1.00 | 0.00% |
| 2002 | 1.00 | 0.00% |
| 2003 | 1.00 | 0.00% |
| 2004 | 1.00 | 0.00% |
| 2005 | .90 | -10.00% |
| 2006 | .80 | -11.11% |
| 2007 | .90 | 12.50% |
| 2008 | .80 | -11.11% |
| 2009 | .80 | 0.00% |
| 2010 | .80 | 0.00% |
| 2011 | .80 | 0.00% |
| 2012 | .80 | 0.00% |
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