|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | 5.49 % |
| 1982 | .01 | 11.25 % |
| 1983 | .01 | 5.24 % |
| 1984 | .01 | 9.25 % |
| 1985 | .01 | 1.95 % |
| 1986 | .01 | 4.31 % |
| 1987 | .01 | 1.53 % |
| 1988 | .01 | 4.22 % |
| 1989 | .01 | 0.43 % |
| 1990 | .01 | 1.15 % |
| 1991 | .01 | 2.85 % |
| 1992 | .01 | 3.05 % |
| 1993 | .01 | 0.00 % |
| 1994 | .01 | 2.55 % |
| 1995 | .02 | 177.33 % |
| 1996 | .02 | 10.54 % |
| 1997 | .03 | 17.19 % |
| 1998 | .03 | 16.78 % |
| 1999 | .03 | 1.94 % |
| 2000 | .03 | 4.54 % |
| 2001 | .04 | 16.68 % |
| 2002 | .04 | 7.56 % |
| 2003 | .05 | 9.13 % |
| 2004 | .05 | 11.43 % |
| 2005 | .06 | 6.19 % |
| 2006 | .06 | 9.95 % |
| 2007 | .07 | 7.96 % |
| 2008 | .07 | 4.71 % |
| 2009 | .07 | -3.62 % |
| 2010 | .06 | -7.61 % |
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