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| year | consumption | change |
| 1986 | 1.90 | NA |
| 1987 | .50 | -73.68% |
| 1988 | .70 | 40.00% |
| 1989 | .60 | -14.29% |
| 1990 | .50 | -16.67% |
| 1991 | 1.10 | 120.00% |
| 1992 | 1.90 | 72.73% |
| 1993 | 2.00 | 5.26% |
| 1994 | 2.10 | 5.00% |
| 1995 | 1.10 | -47.62% |
| 1996 | 1.10 | 0.00% |
| 1997 | 2.40 | 118.18% |
| 1998 | 2.30 | -4.17% |
| 1999 | .50 | -78.26% |
| 2000 | .50 | 0.00% |
| 2001 | .40 | -20.00% |
| 2002 | .10 | -75.00% |
| 2003 | .10 | 0.00% |
| 2004 | .10 | 0.00% |
| 2005 | .10 | 0.00% |
| 2006 | .10 | 0.00% |
| 2007 | .10 | 0.00% |
| 2009 | .30 | 200.00% |
| 2011 | .20 | -33.33% |
| 2012 | .20 | 0.00% |
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