|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .07 | NA |
| 1987 | .07 | 0.00 % |
| 1988 | .07 | -0.27 % |
| 1989 | .07 | 0.27 % |
| 1990 | .09 | 33.34 % |
| 1991 | .09 | 0.00 % |
| 1992 | .09 | -0.27 % |
| 1993 | .09 | 0.27 % |
| 1994 | .09 | 0.00 % |
| 1995 | .09 | -0.27 % |
| 1996 | .09 | 0.00 % |
| 1997 | .09 | 0.27 % |
| 1998 | .12 | 25.00 % |
| 1999 | .12 | 0.01 % |
| 2000 | .12 | -0.27 % |
| 2001 | .14 | 20.33 % |
| 2002 | .14 | 0.00 % |
| 2003 | .14 | 0.00 % |
| 2004 | .16 | 16.35 % |
| 2005 | .19 | 14.60 % |
| 2006 | .16 | -12.50 % |
| 2007 | .19 | 14.29 % |
| 2008 | .19 | 0.00 % |
| 2009 | .19 | 0.00 % |
| 2010 | .19 | 0.00 % |
|
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