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| year | consumption | change |
| 1986 | .00 | NA |
| 1987 | .50 | NA |
| 1988 | 1.20 | 140.00% |
| 1989 | 1.10 | -8.33% |
| 1990 | 1.30 | 18.18% |
| 1991 | 2.00 | 53.85% |
| 1992 | .10 | -95.00% |
| 1993 | 1.90 | 1,800.00% |
| 1994 | 1.90 | 0.00% |
| 1995 | 1.90 | 0.00% |
| 1996 | 1.90 | 0.00% |
| 1997 | 1.90 | 0.00% |
| 1998 | 1.80 | -5.26% |
| 1999 | 1.80 | 0.00% |
| 2000 | 1.80 | 0.00% |
| 2001 | 1.80 | 0.00% |
| 2002 | 1.80 | 0.00% |
| 2003 | 1.80 | 0.00% |
| 2004 | 1.90 | 5.56% |
| 2005 | 2.00 | 5.26% |
| 2006 | 2.50 | 25.00% |
| 2007 | 2.50 | 0.00% |
| 2008 | 2.50 | 0.00% |
| 2009 | 2.70 | 8.00% |
| 2010 | 2.70 | 0.00% |
| 2011 | 2.70 | 0.00% |
| 2012 | 2.70 | 0.00% |
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