|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.46 % |
| 1982 | .00 | -29.15 % |
| 1983 | .01 | 46.27 % |
| 1984 | .01 | -2.48 % |
| 1985 | .01 | 17.64 % |
| 1986 | .01 | -2.92 % |
| 1987 | .01 | -21.73 % |
| 1988 | .01 | 19.73 % |
| 1989 | .01 | 7.26 % |
| 1990 | .01 | 15.76 % |
| 1991 | .01 | 14.40 % |
| 1992 | .01 | 12.19 % |
| 1993 | .01 | 9.03 % |
| 1994 | .01 | 5.14 % |
| 1995 | .01 | 9.17 % |
| 1996 | .02 | 7.42 % |
| 1997 | .02 | 8.74 % |
| 1998 | .02 | 7.13 % |
| 1999 | .02 | 9.35 % |
| 2000 | .02 | 24.16 % |
| 2001 | .02 | 0.95 % |
| 2002 | .03 | 5.92 % |
| 2003 | .03 | 17.69 % |
| 2004 | .04 | 16.48 % |
| 2005 | .04 | 4.75 % |
| 2006 | .04 | 17.88 % |
| 2007 | .05 | 8.56 % |
| 2008 | .05 | 5.85 % |
| 2009 | .07 | 30.44 % |
| 2010 | .07 | 11.88 % |
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