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| year | consumption | change |
| 1986 | .70 | NA |
| 1987 | .70 | 0.00 % |
| 1988 | 2.50 | 257.14 % |
| 1989 | 3.40 | 36.00 % |
| 1990 | 3.60 | 5.88 % |
| 1991 | 4.00 | 11.11 % |
| 1992 | 4.30 | 7.50 % |
| 1993 | 4.50 | 4.65 % |
| 1994 | 5.00 | 11.11 % |
| 1995 | 5.70 | 14.00 % |
| 1996 | 3.80 | -33.33 % |
| 1997 | 6.00 | 57.89 % |
| 1998 | 6.10 | 1.67 % |
| 1999 | 6.10 | 0.00 % |
| 2000 | 6.50 | 6.56 % |
| 2001 | 6.50 | 0.00 % |
| 2002 | 6.50 | 0.00 % |
| 2003 | 7.00 | 7.69 % |
| 2004 | 7.10 | 1.43 % |
| 2005 | 7.20 | 1.41 % |
| 2006 | 7.70 | 6.94 % |
| 2007 | 6.60 | -14.29 % |
| 2008 | 6.60 | 0.00 % |
| 2009 | 6.70 | 1.52 % |
| 2010 | 6.80 | 1.49 % |
| 2011 | 6.40 | -5.88 % |
| 2012 | 6.30 | -1.56 % |
| 2013 | 6.40 | 1.59 % |
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