|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 5.52 % |
| 1982 | .01 | 9.04 % |
| 1983 | .02 | 12.44 % |
| 1984 | .02 | 5.05 % |
| 1985 | .02 | 2.96 % |
| 1986 | .02 | -0.06 % |
| 1987 | .02 | 9.04 % |
| 1988 | .02 | 7.14 % |
| 1989 | .02 | 11.12 % |
| 1990 | .02 | 6.87 % |
| 1991 | .03 | 8.20 % |
| 1992 | .03 | 3.83 % |
| 1993 | .03 | 1.88 % |
| 1994 | .03 | 22.96 % |
| 1995 | .03 | -0.64 % |
| 1996 | .03 | 3.36 % |
| 1997 | .03 | 1.61 % |
| 1998 | .04 | 25.47 % |
| 1999 | .04 | 0.09 % |
| 2000 | .04 | 3.23 % |
| 2001 | .05 | 4.08 % |
| 2002 | .05 | -0.13 % |
| 2003 | .05 | 0.17 % |
| 2004 | .05 | 1.00 % |
| 2005 | .05 | 1.87 % |
| 2006 | .05 | 1.10 % |
| 2007 | .05 | 2.47 % |
| 2008 | .05 | 3.04 % |
| 2009 | .05 | 3.19 % |
| 2010 | .05 | -0.10 % |
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