|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .33 | NA |
| 1987 | .33 | 0.00 % |
| 1988 | .33 | -0.27 % |
| 1989 | .35 | 7.44 % |
| 1990 | .35 | 0.00 % |
| 1991 | .35 | 0.00 % |
| 1992 | .35 | -0.27 % |
| 1993 | .35 | 0.27 % |
| 1994 | .35 | 0.00 % |
| 1995 | .37 | 6.67 % |
| 1996 | .37 | -0.27 % |
| 1997 | .37 | 0.27 % |
| 1998 | .37 | 0.00 % |
| 1999 | .37 | 0.00 % |
| 2000 | .37 | -0.27 % |
| 2001 | .37 | 0.27 % |
| 2002 | .40 | 6.25 % |
| 2003 | .40 | 0.00 % |
| 2004 | .44 | 11.46 % |
| 2005 | .47 | 5.55 % |
| 2006 | .44 | -5.00 % |
| 2007 | .44 | 0.00 % |
| 2008 | .44 | 0.00 % |
| 2009 | .47 | 5.26 % |
| 2010 | .47 | 0.00 % |
|
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