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| year | consumption | change |
| 1986 | 1.90 | NA |
| 1987 | .40 | -78.95% |
| 1988 | 4.30 | 975.00% |
| 1989 | 4.70 | 9.30% |
| 1990 | 5.50 | 17.02% |
| 1991 | 4.00 | -27.27% |
| 1992 | 1.60 | -60.00% |
| 1993 | 1.90 | 18.75% |
| 1994 | 1.20 | -36.84% |
| 1995 | 1.00 | -16.67% |
| 1996 | 1.20 | 20.00% |
| 1998 | .80 | -33.33% |
| 1999 | .80 | 0.00% |
| 2000 | .80 | 0.00% |
| 2001 | .80 | 0.00% |
| 2002 | 1.50 | 87.50% |
| 2003 | 2.20 | 46.67% |
| 2004 | 2.40 | 9.09% |
| 2005 | 2.50 | 4.17% |
| 2006 | 3.80 | 52.00% |
| 2008 | .00 | -100.00% |
| 2009 | 1.80 | NA |
| 2010 | 4.00 | 122.22% |
| 2011 | 3.80 | -5.00% |
| 2012 | 3.90 | 2.63% |
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