|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | -4.66 % |
| 1982 | .01 | -3.74 % |
| 1983 | .01 | -20.52 % |
| 1984 | .01 | 17.26 % |
| 1985 | .01 | 24.68 % |
| 1986 | .01 | -3.53 % |
| 1987 | .01 | 10.12 % |
| 1988 | .01 | 5.51 % |
| 1989 | .01 | 4.31 % |
| 1990 | .01 | -2.62 % |
| 1991 | .01 | -0.49 % |
| 1992 | .01 | 0.08 % |
| 1993 | .01 | -8.85 % |
| 1994 | .02 | 41.64 % |
| 1995 | .02 | -0.51 % |
| 1996 | .01 | -7.08 % |
| 1997 | .01 | -22.94 % |
| 1998 | .01 | 0.00 % |
| 1999 | .02 | 49.47 % |
| 2000 | .02 | -2.39 % |
| 2001 | .02 | 0.79 % |
| 2002 | .02 | 0.61 % |
| 2003 | .02 | -7.89 % |
| 2004 | .01 | -4.71 % |
| 2005 | .01 | -1.51 % |
| 2006 | .02 | 11.15 % |
| 2007 | .02 | 13.67 % |
| 2008 | .02 | 0.66 % |
| 2009 | .02 | -4.66 % |
| 2010 | .02 | -0.63 % |
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