|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .44 | NA |
| 1987 | .41 | -7.06 % |
| 1988 | .45 | 8.98 % |
| 1989 | .46 | 3.37 % |
| 1990 | .43 | -6.74 % |
| 1991 | .47 | 10.04 % |
| 1992 | .48 | 0.70 % |
| 1993 | .54 | 13.65 % |
| 1994 | .57 | 5.88 % |
| 1995 | .57 | 0.00 % |
| 1996 | .57 | -0.27 % |
| 1997 | .60 | 5.84 % |
| 1998 | .60 | 0.00 % |
| 1999 | .60 | 0.00 % |
| 2000 | .67 | 10.22 % |
| 2001 | .70 | 5.05 % |
| 2002 | .70 | 0.00 % |
| 2003 | .76 | 9.09 % |
| 2004 | .79 | 3.88 % |
| 2005 | .89 | 12.31 % |
| 2006 | .86 | -3.57 % |
| 2007 | .86 | 0.00 % |
| 2008 | .89 | 3.70 % |
| 2009 | .44 | -50.00 % |
| 2010 | .44 | 0.00 % |
|
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