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| year | consumption | change |
| 1986 | 2.20 | NA |
| 1987 | 2.40 | 9.09% |
| 1988 | 2.00 | -16.67% |
| 1989 | 4.40 | 120.00% |
| 1990 | 3.40 | -22.73% |
| 1991 | 3.40 | 0.00% |
| 1992 | 3.80 | 11.76% |
| 1993 | 3.70 | -2.63% |
| 1994 | 3.80 | 2.70% |
| 1995 | 3.70 | -2.63% |
| 1996 | 3.80 | 2.70% |
| 1997 | 3.80 | 0.00% |
| 1998 | 3.80 | 0.00% |
| 1999 | 3.80 | 0.00% |
| 2000 | 3.90 | 2.63% |
| 2001 | 3.90 | 0.00% |
| 2002 | 3.80 | -2.56% |
| 2003 | 4.00 | 5.26% |
| 2004 | .90 | -77.50% |
| 2005 | 4.00 | 344.44% |
| 2006 | 8.00 | 100.00% |
| 2007 | 7.90 | -1.25% |
| 2008 | 8.00 | 1.27% |
| 2009 | 8.00 | 0.00% |
| 2010 | 8.00 | 0.00% |
| 2011 | 8.00 | 0.00% |
| 2012 | 8.00 | 0.00% |
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