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| year | consumption | change |
| 1986 | 2.20 | NA |
| 1987 | 4.00 | 81.82% |
| 1988 | 4.30 | 7.50% |
| 1989 | 4.80 | 11.63% |
| 1990 | 4.30 | -10.42% |
| 1991 | 4.60 | 6.98% |
| 1992 | 4.20 | -8.70% |
| 1993 | 4.40 | 4.76% |
| 1994 | 3.70 | -15.91% |
| 1995 | 1.80 | -51.35% |
| 1996 | 1.40 | -22.22% |
| 1997 | .70 | -50.00% |
| 1998 | .10 | -85.71% |
| 2001 | .10 | 0.00% |
| 2002 | .10 | 0.00% |
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