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| year | consumption | change |
| 1986 | .70 | NA |
| 1987 | .70 | 0.00% |
| 1988 | .70 | 0.00% |
| 1989 | .70 | 0.00% |
| 1990 | .70 | 0.00% |
| 1991 | .80 | 14.29% |
| 1992 | .80 | 0.00% |
| 1993 | .80 | 0.00% |
| 1994 | .80 | 0.00% |
| 1995 | 3.80 | 375.00% |
| 1996 | 4.50 | 18.42% |
| 1997 | 7.10 | 57.78% |
| 1998 | 7.90 | 11.27% |
| 1999 | 7.20 | -8.86% |
| 2000 | 7.70 | 6.94% |
| 2001 | 9.50 | 23.38% |
| 2002 | 10.00 | 5.26% |
| 2003 | 11.00 | 10.00% |
| 2004 | 12.00 | 9.09% |
| 2005 | 12.00 | 0.00% |
| 2006 | 12.00 | 0.00% |
| 2007 | 13.00 | 8.33% |
| 2008 | 13.00 | 0.00% |
| 2009 | 12.00 | -7.69% |
| 2010 | 12.00 | 0.00% |
| 2011 | 12.00 | 0.00% |
| 2012 | 12.00 | 0.00% |
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