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| year | consumption | change |
| 1986 | 1.70 | NA |
| 1987 | .20 | -88.24% |
| 1988 | .20 | 0.00% |
| 1989 | .10 | -50.00% |
| 1990 | .30 | 200.00% |
| 1991 | .30 | 0.00% |
| 1992 | 2.80 | 833.33% |
| 1993 | 1.10 | -60.71% |
| 1994 | 1.10 | 0.00% |
| 1995 | .90 | -18.18% |
| 1996 | 1.20 | 33.33% |
| 1997 | .40 | -66.67% |
| 1998 | .40 | 0.00% |
| 1999 | .10 | -75.00% |
| 2000 | .20 | 100.00% |
| 2001 | .20 | 0.00% |
| 2002 | .20 | 0.00% |
| 2003 | .10 | -50.00% |
| 2004 | .20 | 100.00% |
| 2005 | .20 | 0.00% |
| 2006 | 1.60 | 700.00% |
| 2007 | 2.50 | 56.25% |
| 2008 | 1.70 | -32.00% |
| 2009 | 1.30 | -23.53% |
| 2010 | .60 | -53.85% |
| 2011 | .60 | 0.00% |
| 2012 | .60 | 0.00% |
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