|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .09 | NA |
| 1987 | .14 | 50.01 % |
| 1988 | .19 | 32.97 % |
| 1989 | .19 | 0.27 % |
| 1990 | .19 | 0.00 % |
| 1991 | .22 | 15.54 % |
| 1992 | .21 | -2.89 % |
| 1993 | .23 | 11.41 % |
| 1994 | .28 | 20.00 % |
| 1995 | .28 | 0.00 % |
| 1996 | .33 | 16.35 % |
| 1997 | .33 | 0.27 % |
| 1998 | .26 | -21.43 % |
| 1999 | .26 | 0.00 % |
| 2000 | .28 | 8.79 % |
| 2001 | .33 | 16.99 % |
| 2002 | .33 | 0.00 % |
| 2003 | .33 | 0.00 % |
| 2004 | .35 | 6.85 % |
| 2005 | .35 | 0.27 % |
| 2006 | .33 | -6.67 % |
| 2007 | .33 | 0.00 % |
| 2008 | .33 | 0.00 % |
| 2009 | .33 | 0.00 % |
| 2010 | .33 | 0.00 % |
|
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