|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .17 | NA |
| 1987 | .19 | 14.62 % |
| 1988 | .21 | 10.92 % |
| 1989 | .29 | 36.30 % |
| 1990 | .25 | -11.21 % |
| 1991 | .26 | 0.45 % |
| 1992 | .36 | 40.65 % |
| 1993 | .35 | -3.13 % |
| 1994 | .32 | -8.66 % |
| 1995 | .36 | 13.02 % |
| 1996 | .32 | -11.76 % |
| 1997 | .42 | 33.70 % |
| 1998 | .44 | 5.00 % |
| 1999 | .42 | -4.76 % |
| 2000 | .51 | 19.67 % |
| 2001 | .51 | 0.27 % |
| 2002 | .66 | 29.17 % |
| 2003 | .70 | 6.45 % |
| 2004 | .50 | -29.00 % |
| 2005 | .34 | -31.71 % |
| 2006 | .21 | -37.50 % |
| 2007 | .30 | 40.00 % |
| 2008 | .34 | 14.29 % |
| 2009 | .40 | 18.75 % |
| 2010 | .17 | -57.90 % |
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