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| year | consumption | change |
| 1986 | .70 | NA |
| 1987 | .70 | 0.00% |
| 1988 | .60 | -14.29% |
| 1989 | .60 | 0.00% |
| 1990 | .60 | 0.00% |
| 1991 | .50 | -16.67% |
| 1992 | .50 | 0.00% |
| 1993 | .40 | -20.00% |
| 1994 | .40 | 0.00% |
| 1995 | .30 | -25.00% |
| 1996 | .30 | 0.00% |
| 1997 | .60 | 100.00% |
| 1998 | .60 | 0.00% |
| 1999 | .40 | -33.33% |
| 2000 | .20 | -50.00% |
| 2001 | .20 | 0.00% |
| 2002 | .10 | -50.00% |
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