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| year | consumption | change |
| 1986 | .80 | NA |
| 1987 | 1.00 | 25.00% |
| 1988 | 1.00 | 0.00% |
| 1989 | 1.10 | 10.00% |
| 1990 | 1.10 | 0.00% |
| 1991 | 1.10 | 0.00% |
| 1992 | 1.10 | 0.00% |
| 1993 | 1.10 | 0.00% |
| 1994 | 1.10 | 0.00% |
| 1995 | 1.10 | 0.00% |
| 1996 | 1.20 | 9.09% |
| 1997 | .50 | -58.33% |
| 1998 | .60 | 20.00% |
| 1999 | .70 | 16.67% |
| 2000 | .60 | -14.29% |
| 2001 | 2.90 | 383.33% |
| 2002 | 3.20 | 10.34% |
| 2003 | 5.30 | 65.63% |
| 2004 | 3.20 | -39.62% |
| 2005 | 1.70 | -46.88% |
| 2006 | 2.00 | 17.65% |
| 2007 | 3.00 | 50.00% |
| 2008 | 1.60 | -46.67% |
| 2009 | 1.30 | -18.75% |
| 2010 | 1.40 | 7.69% |
| 2011 | 1.50 | 7.14% |
| 2012 | 1.30 | -13.33% |
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