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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | 1.20 | 20.00% |
| 1988 | 1.30 | 8.33% |
| 1989 | 1.20 | -7.69% |
| 1990 | .70 | -41.67% |
| 1991 | .60 | -14.29% |
| 1992 | 1.00 | 66.67% |
| 1993 | .90 | -10.00% |
| 1994 | 1.80 | 100.00% |
| 1995 | 1.80 | 0.00% |
| 1996 | 1.50 | -16.67% |
| 1997 | 1.30 | -13.33% |
| 1998 | 1.90 | 46.15% |
| 1999 | 1.80 | -5.26% |
| 2000 | 1.20 | -33.33% |
| 2001 | 1.00 | -16.67% |
| 2002 | 1.00 | 0.00% |
| 2003 | 1.00 | 0.00% |
| 2004 | .90 | -10.00% |
| 2005 | .70 | -22.22% |
| 2006 | .70 | 0.00% |
| 2007 | .80 | 14.29% |
| 2008 | .60 | -25.00% |
| 2012 | .10 | -83.33% |
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