|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | -6.04 % |
| 1982 | .01 | -0.44 % |
| 1983 | .01 | 3.67 % |
| 1984 | .01 | 17.92 % |
| 1985 | .01 | -2.27 % |
| 1986 | .01 | -15.18 % |
| 1987 | .01 | -4.28 % |
| 1988 | .01 | 4.24 % |
| 1989 | .01 | 14.30 % |
| 1990 | .01 | -0.67 % |
| 1991 | .02 | 62.98 % |
| 1992 | .01 | -26.93 % |
| 1993 | .01 | -15.54 % |
| 1994 | .01 | 8.48 % |
| 1995 | .01 | 9.15 % |
| 1996 | .01 | -3.74 % |
| 1997 | .01 | -5.41 % |
| 1998 | .01 | 9.56 % |
| 1999 | .02 | 41.84 % |
| 2000 | .02 | 25.99 % |
| 2001 | .02 | -27.52 % |
| 2002 | .02 | 29.60 % |
| 2003 | .03 | 55.78 % |
| 2004 | .03 | 5.96 % |
| 2005 | .03 | -1.27 % |
| 2006 | .03 | 3.85 % |
| 2007 | .04 | 7.92 % |
| 2008 | .04 | 13.62 % |
| 2009 | .02 | -48.86 % |
| 2010 | .02 | 5.72 % |
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