|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | -0.22 % |
| 1982 | .00 | -55.85 % |
| 1983 | .00 | -2.00 % |
| 1984 | .00 | 21.94 % |
| 1985 | .00 | -1.26 % |
| 1986 | .00 | -66.10 % |
| 1987 | .00 | 11.25 % |
| 1988 | .00 | 43.82 % |
| 1989 | .00 | 7.03 % |
| 1990 | .00 | 6.57 % |
| 1991 | .00 | 2.74 % |
| 1992 | .00 | 6.00 % |
| 1993 | .00 | -13.84 % |
| 1994 | .00 | 29.93 % |
| 1995 | .00 | -2.25 % |
| 1996 | .00 | 5.75 % |
| 1997 | .00 | 0.00 % |
| 1998 | .00 | 0.54 % |
| 1999 | .00 | 0.00 % |
| 2000 | .00 | 71.89 % |
| 2001 | .00 | -32.70 % |
| 2002 | .00 | 6.54 % |
| 2003 | .00 | -0.44 % |
| 2004 | .00 | 90.75 % |
| 2005 | .00 | -13.86 % |
| 2006 | .00 | 12.60 % |
| 2007 | .00 | 17.38 % |
| 2008 | .01 | 2.84 % |
| 2009 | .01 | 8.88 % |
| 2010 | .01 | 0.00 % |
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