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| year | consumption | change |
| 1986 | 9.30 | NA |
| 1987 | 9.80 | 5.38% |
| 1988 | 9.90 | 1.02% |
| 1989 | .90 | -90.91% |
| 1990 | .80 | -11.11% |
| 1991 | 1.60 | 100.00% |
| 1992 | 3.30 | 106.25% |
| 1993 | 2.50 | -24.24% |
| 1994 | 2.40 | -4.00% |
| 1995 | .90 | -62.50% |
| 1996 | 1.80 | 100.00% |
| 1997 | 1.30 | -27.78% |
| 1998 | 1.80 | 38.46% |
| 1999 | 2.40 | 33.33% |
| 2000 | 1.40 | -41.67% |
| 2001 | 2.30 | 64.29% |
| 2002 | 1.50 | -34.78% |
| 2003 | .70 | -53.33% |
| 2004 | .70 | 0.00% |
| 2005 | 1.10 | 57.14% |
| 2006 | .40 | -63.64% |
| 2007 | .20 | -50.00% |
| 2008 | .30 | 50.00% |
| 2009 | .30 | 0.00% |
| 2010 | .30 | 0.00% |
| 2011 | .60 | 100.00% |
| 2012 | .50 | -16.67% |
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