|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .00 | -13.98 % |
| 1982 | .01 | 27.54 % |
| 1983 | .01 | 2.83 % |
| 1984 | .00 | -20.31 % |
| 1985 | .00 | 0.43 % |
| 1986 | .01 | 16.56 % |
| 1987 | .01 | 10.33 % |
| 1988 | .01 | 18.06 % |
| 1989 | .01 | 12.75 % |
| 1990 | .01 | 19.47 % |
| 1991 | .01 | 13.04 % |
| 1992 | .01 | -19.91 % |
| 1993 | .01 | 31.01 % |
| 1994 | .01 | 3.63 % |
| 1995 | .01 | 13.94 % |
| 1996 | .01 | -0.23 % |
| 1997 | .01 | 0.23 % |
| 1998 | .01 | 1.73 % |
| 1999 | .01 | 0.00 % |
| 2000 | .01 | 1.03 % |
| 2001 | .02 | 40.32 % |
| 2002 | .02 | 2.50 % |
| 2003 | .02 | 4.47 % |
| 2004 | .02 | -1.85 % |
| 2005 | .02 | 4.01 % |
| 2006 | .02 | 1.52 % |
| 2007 | .02 | -1.64 % |
| 2008 | .02 | -3.20 % |
| 2009 | .02 | -9.01 % |
| 2010 | .02 | 12.99 % |
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