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| year | consumption | change |
| 1986 | .90 | NA |
| 1987 | 1.20 | 33.33% |
| 1988 | .60 | -50.00% |
| 1989 | .80 | 33.33% |
| 1990 | .70 | -12.50% |
| 1991 | .60 | -14.29% |
| 1992 | .60 | 0.00% |
| 1993 | .40 | -33.33% |
| 1994 | .30 | -25.00% |
| 1995 | .20 | -33.33% |
| 1996 | .20 | 0.00% |
| 1997 | .20 | 0.00% |
| 1998 | .60 | 200.00% |
| 1999 | 1.20 | 100.00% |
| 2000 | 2.40 | 100.00% |
| 2001 | 2.10 | -12.50% |
| 2002 | 2.30 | 9.52% |
| 2003 | 2.70 | 17.39% |
| 2004 | 2.80 | 3.70% |
| 2005 | 3.20 | 14.29% |
| 2006 | 4.00 | 25.00% |
| 2007 | 3.60 | -10.00% |
| 2008 | 3.80 | 5.56% |
| 2009 | 5.00 | 31.58% |
| 2010 | 5.00 | 0.00% |
| 2011 | 4.40 | -12.00% |
| 2012 | 4.20 | -4.55% |
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