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| year | consumption | change |
| 1986 | 6.10 | NA |
| 1987 | 6.00 | -1.64% |
| 1988 | 5.10 | -15.00% |
| 1989 | 4.30 | -15.69% |
| 1990 | 4.30 | 0.00% |
| 1991 | 3.60 | -16.28% |
| 1992 | 3.00 | -16.67% |
| 1993 | 7.50 | 150.00% |
| 1994 | 4.90 | -34.67% |
| 1995 | 4.20 | -14.29% |
| 1996 | 4.20 | 0.00% |
| 1997 | 5.70 | 35.71% |
| 1998 | .10 | -98.25% |
| 1999 | 4.00 | 3,900.00% |
| 2000 | 2.70 | -32.50% |
| 2001 | 2.10 | -22.22% |
| 2002 | 1.90 | -9.52% |
| 2003 | 1.20 | -36.84% |
| 2004 | 2.20 | 83.33% |
| 2005 | 3.50 | 59.09% |
| 2006 | 7.90 | 125.71% |
| 2007 | 2.60 | -67.09% |
| 2008 | 4.40 | 69.23% |
| 2009 | 2.30 | -47.73% |
| 2010 | 3.90 | 69.57% |
| 2011 | .40 | -89.74% |
| 2012 | .80 | 100.00% |
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