|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.57 % |
| 1982 | .01 | 7.34 % |
| 1983 | .01 | -5.70 % |
| 1984 | .01 | -0.46 % |
| 1985 | .01 | 8.96 % |
| 1986 | .01 | 7.88 % |
| 1987 | .01 | 7.39 % |
| 1988 | .01 | 8.88 % |
| 1989 | .01 | -0.20 % |
| 1990 | .01 | 0.88 % |
| 1991 | .02 | 4.79 % |
| 1992 | .01 | -26.92 % |
| 1993 | .01 | -17.62 % |
| 1994 | .01 | 12.51 % |
| 1995 | .01 | 15.59 % |
| 1996 | .01 | -0.25 % |
| 1997 | .01 | 2.47 % |
| 1998 | .01 | 0.32 % |
| 1999 | .01 | 0.00 % |
| 2000 | .01 | 7.06 % |
| 2001 | .01 | 2.32 % |
| 2002 | .01 | 1.68 % |
| 2003 | .01 | 2.30 % |
| 2004 | .02 | 18.37 % |
| 2005 | .02 | -0.48 % |
| 2006 | .02 | -0.90 % |
| 2007 | .02 | 7.66 % |
| 2008 | .02 | 18.81 % |
| 2009 | .02 | -6.46 % |
| 2010 | .02 | 2.47 % |
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