|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | -7.28 % |
| 1982 | .00 | -5.52 % |
| 1983 | .00 | 0.00 % |
| 1984 | .00 | 8.00 % |
| 1985 | .00 | 0.28 % |
| 1986 | .00 | 19.60 % |
| 1987 | .00 | -17.34 % |
| 1988 | .00 | -24.71 % |
| 1989 | .00 | 38.17 % |
| 1990 | .00 | 36.74 % |
| 1991 | .01 | 10.71 % |
| 1992 | .00 | -13.50 % |
| 1993 | .00 | -6.75 % |
| 1994 | .00 | 1.58 % |
| 1995 | .01 | 22.94 % |
| 1996 | .00 | -10.33 % |
| 1997 | .01 | 51.52 % |
| 1998 | .01 | -0.40 % |
| 1999 | .01 | 2.68 % |
| 2000 | .01 | 40.03 % |
| 2001 | .01 | 33.24 % |
| 2002 | .01 | -3.84 % |
| 2003 | .01 | 2.40 % |
| 2004 | .02 | 7.38 % |
| 2005 | .02 | 5.62 % |
| 2006 | .02 | 6.95 % |
| 2007 | .02 | 2.52 % |
| 2008 | .02 | 1.71 % |
| 2009 | .01 | -33.05 % |
| 2010 | .01 | 4.78 % |
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