|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .33 | NA |
| 1987 | .33 | 0.00 % |
| 1988 | .33 | -0.27 % |
| 1989 | .37 | 12.81 % |
| 1990 | .39 | 5.55 % |
| 1991 | .39 | 0.00 % |
| 1992 | .41 | 4.98 % |
| 1993 | .41 | 0.27 % |
| 1994 | .37 | -10.00 % |
| 1995 | .41 | 11.11 % |
| 1996 | .41 | -0.27 % |
| 1997 | .41 | 0.27 % |
| 1998 | .41 | 0.00 % |
| 1999 | .41 | 0.00 % |
| 2000 | .43 | 4.71 % |
| 2001 | .43 | 0.28 % |
| 2002 | .45 | 4.76 % |
| 2003 | .45 | 0.00 % |
| 2004 | .45 | -0.27 % |
| 2005 | .47 | 4.83 % |
| 2006 | .47 | 0.00 % |
| 2007 | .49 | 4.35 % |
| 2008 | .49 | 0.00 % |
| 2009 | .49 | 0.00 % |
| 2010 | .49 | 0.00 % |
|
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