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| year | consumption | change |
| 1986 | .00 | NA |
| 1987 | .00 | NA |
| 1988 | .00 | NA |
| 1989 | .60 | NA |
| 1990 | .70 | 16.67% |
| 1991 | .80 | 14.29% |
| 1992 | .80 | 0.00% |
| 1993 | .80 | 0.00% |
| 1994 | .70 | -12.50% |
| 1995 | 1.20 | 71.43% |
| 1996 | .80 | -33.33% |
| 1997 | 1.50 | 87.50% |
| 1998 | 1.30 | -13.33% |
| 1999 | 1.30 | 0.00% |
| 2000 | 1.10 | -15.38% |
| 2001 | 2.00 | 81.82% |
| 2002 | 1.80 | -10.00% |
| 2003 | 1.90 | 5.56% |
| 2004 | 2.00 | 5.26% |
| 2005 | 2.20 | 10.00% |
| 2006 | 2.30 | 4.55% |
| 2007 | 2.50 | 8.70% |
| 2008 | 1.60 | -36.00% |
| 2009 | 1.50 | -6.25% |
| 2010 | 1.50 | 0.00% |
| 2011 | 1.50 | 0.00% |
| 2012 | 1.50 | 0.00% |
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