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| year | consumption | change |
| 1986 | 3.40 | NA |
| 1987 | 3.90 | 14.71 % |
| 1988 | 3.90 | 0.00 % |
| 1989 | 4.20 | 7.69 % |
| 1990 | 4.60 | 9.52 % |
| 1991 | 3.80 | -17.39 % |
| 1992 | 4.60 | 21.05 % |
| 1993 | 4.40 | -4.35 % |
| 1994 | 2.00 | -54.55 % |
| 1995 | 5.30 | 165.00 % |
| 1996 | 1.70 | -67.92 % |
| 1997 | .70 | -58.82 % |
| 1998 | .60 | -14.29 % |
| 1999 | .60 | 0.00 % |
| 2000 | .60 | 0.00 % |
| 2001 | 2.90 | 383.33 % |
| 2002 | 3.30 | 13.79 % |
| 2003 | .90 | -72.73 % |
| 2004 | .70 | -22.22 % |
| 2005 | 1.30 | 85.71 % |
| 2006 | .80 | -38.46 % |
| 2008 | 1.30 | 62.50 % |
| 2009 | .80 | -38.46 % |
| 2010 | 2.80 | 250.00 % |
| 2011 | 4.30 | 53.57 % |
| 2012 | 3.40 | -20.93 % |
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