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| year | consumption | change |
| 1986 | 2.40 | NA |
| 1987 | 2.20 | -8.33% |
| 1988 | 2.00 | -9.09% |
| 1989 | 2.10 | 5.00% |
| 1990 | 2.10 | 0.00% |
| 1991 | 1.90 | -9.52% |
| 1992 | 2.00 | 5.26% |
| 1993 | 1.90 | -5.00% |
| 1994 | 2.00 | 5.26% |
| 1995 | 1.70 | -15.00% |
| 1996 | 1.70 | 0.00% |
| 1997 | 1.50 | -11.76% |
| 1998 | 1.00 | -33.33% |
| 1999 | .90 | -10.00% |
| 2000 | .80 | -11.11% |
| 2001 | 1.00 | 25.00% |
| 2002 | 1.10 | 10.00% |
| 2003 | .60 | -45.45% |
| 2004 | .40 | -33.33% |
| 2005 | 34.00 | 8,400.00% |
| 2006 | 17.00 | -50.00% |
| 2007 | 21.00 | 23.53% |
| 2008 | .30 | -98.57% |
| 2009 | .30 | 0.00% |
| 2010 | .20 | -33.33% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
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