|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .31 | NA |
| 1987 | .30 | -2.98 % |
| 1988 | .29 | -4.02 % |
| 1989 | .25 | -12.68 % |
| 1990 | .31 | 23.65 % |
| 1991 | .26 | -16.37 % |
| 1992 | .27 | 2.35 % |
| 1993 | .28 | 3.46 % |
| 1994 | .38 | 38.46 % |
| 1995 | .38 | 0.00 % |
| 1996 | .38 | -0.27 % |
| 1997 | .38 | 0.27 % |
| 1998 | .40 | 5.56 % |
| 1999 | .40 | 0.00 % |
| 2000 | .40 | -0.27 % |
| 2001 | .42 | 5.55 % |
| 2002 | .47 | 10.00 % |
| 2003 | .49 | 4.55 % |
| 2004 | .51 | 4.06 % |
| 2005 | .57 | 12.81 % |
| 2006 | .28 | -50.74 % |
| 2007 | .51 | 80.45 % |
| 2008 | .54 | 5.35 % |
| 2009 | .32 | -40.67 % |
| 2010 | .35 | 10.67 % |
|
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