|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.65 % |
| 1982 | .01 | 0.16 % |
| 1983 | .01 | 0.49 % |
| 1984 | .01 | 0.00 % |
| 1985 | .01 | -4.83 % |
| 1986 | .01 | 17.09 % |
| 1987 | .01 | 4.34 % |
| 1988 | .01 | 2.22 % |
| 1989 | .01 | -10.57 % |
| 1990 | .01 | 6.82 % |
| 1991 | .01 | 15.18 % |
| 1992 | .01 | 1.11 % |
| 1993 | .01 | 5.48 % |
| 1994 | .01 | 17.44 % |
| 1995 | .01 | 2.26 % |
| 1996 | .01 | 4.71 % |
| 1997 | .02 | 56.57 % |
| 1998 | .02 | -8.39 % |
| 1999 | .02 | 2.94 % |
| 2000 | .02 | 3.36 % |
| 2001 | .02 | 0.00 % |
| 2002 | .02 | 4.03 % |
| 2003 | .02 | 4.28 % |
| 2004 | .02 | 1.61 % |
| 2005 | .02 | 2.46 % |
| 2006 | .02 | -0.80 % |
| 2007 | .02 | 11.82 % |
| 2008 | .02 | -3.36 % |
| 2009 | .03 | 27.44 % |
| 2010 | .03 | 1.37 % |
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