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| year | consumption | change |
| 1986 | .00 | NA |
| 1987 | .90 | NA |
| 1988 | .90 | 0.00% |
| 1989 | 1.10 | 22.22% |
| 1990 | .80 | -27.27% |
| 1991 | 1.10 | 37.50% |
| 1992 | .60 | -45.45% |
| 1993 | .60 | 0.00% |
| 1994 | .90 | 50.00% |
| 1995 | .90 | 0.00% |
| 1996 | .90 | 0.00% |
| 1997 | .90 | 0.00% |
| 1998 | .90 | 0.00% |
| 1999 | .90 | 0.00% |
| 2000 | .90 | 0.00% |
| 2001 | .90 | 0.00% |
| 2002 | .50 | -44.44% |
| 2003 | 1.30 | 160.00% |
| 2004 | 1.20 | -7.69% |
| 2005 | 1.40 | 16.67% |
| 2006 | 1.70 | 21.43% |
| 2007 | 1.60 | -5.88% |
| 2008 | 1.90 | 18.75% |
| 2009 | 2.00 | 5.26% |
| 2010 | 2.10 | 5.00% |
| 2011 | 2.00 | -4.76% |
| 2012 | 2.00 | 0.00% |
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