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| year | consumption | change |
| 1986 | 1.90 | NA |
| 1987 | 1.80 | -5.26% |
| 1988 | 1.80 | 0.00% |
| 1989 | 1.40 | -22.22% |
| 1990 | 1.60 | 14.29% |
| 1991 | .50 | -68.75% |
| 1992 | 1.30 | 160.00% |
| 1993 | 1.60 | 23.08% |
| 1994 | 1.70 | 6.25% |
| 1995 | 1.80 | 5.88% |
| 1996 | 1.30 | -27.78% |
| 1997 | .80 | -38.46% |
| 1998 | .20 | -75.00% |
| 1999 | .10 | -50.00% |
| 2003 | .00 | -100.00% |
| 2004 | .00 | NA |
| 2005 | .00 | NA |
| 2008 | .00 | NA |
| 2009 | .00 | NA |
| 2010 | .00 | NA |
| 2012 | .00 | NA |
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