|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | -9.43 % |
| 1982 | .00 | 10.42 % |
| 1983 | .00 | 0.00 % |
| 1984 | .00 | 0.00 % |
| 1985 | .00 | 3.30 % |
| 1986 | .00 | 0.46 % |
| 1987 | .00 | 0.00 % |
| 1988 | .00 | -31.82 % |
| 1989 | .00 | 46.67 % |
| 1990 | .00 | 29.55 % |
| 1991 | .00 | 1.75 % |
| 1992 | .00 | 5.52 % |
| 1993 | .00 | 1.63 % |
| 1994 | .00 | 13.18 % |
| 1995 | .00 | 1.42 % |
| 1996 | .00 | 0.84 % |
| 1997 | .00 | -1.39 % |
| 1998 | .00 | -9.86 % |
| 1999 | .00 | 45.94 % |
| 2000 | .01 | 25.91 % |
| 2001 | .01 | 1.70 % |
| 2002 | .01 | 2.84 % |
| 2003 | .01 | 3.25 % |
| 2004 | .01 | -6.30 % |
| 2005 | .01 | 11.26 % |
| 2006 | .01 | -19.79 % |
| 2007 | .01 | 6.59 % |
| 2008 | .01 | 3.71 % |
| 2009 | .01 | -5.96 % |
| 2010 | .01 | 79.89 % |
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