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| year | consumption | change |
| 1986 | .00 | NA |
| 1987 | 4.20 | NA |
| 1988 | 3.60 | -14.29% |
| 1989 | 4.00 | 11.11% |
| 1990 | 4.20 | 5.00% |
| 1991 | 5.00 | 19.05% |
| 1992 | 5.00 | 0.00% |
| 1993 | 5.00 | 0.00% |
| 1994 | 4.90 | -2.00% |
| 1995 | 4.90 | 0.00% |
| 1996 | 5.00 | 2.04% |
| 1997 | 5.00 | 0.00% |
| 1998 | 5.00 | 0.00% |
| 1999 | 5.00 | 0.00% |
| 2000 | 4.90 | -2.00% |
| 2001 | 5.00 | 2.04% |
| 2002 | 5.90 | 18.00% |
| 2003 | 5.90 | 0.00% |
| 2004 | 7.20 | 22.03% |
| 2005 | 6.70 | -6.94% |
| 2006 | 8.40 | 25.37% |
| 2007 | 8.90 | 5.95% |
| 2008 | 8.50 | -4.49% |
| 2009 | 7.80 | -8.24% |
| 2010 | 7.80 | 0.00% |
| 2011 | 7.80 | 0.00% |
| 2012 | 7.80 | 0.00% |
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