|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | -19.94 % |
| 1982 | .00 | -7.51 % |
| 1983 | .00 | 73.08 % |
| 1984 | .00 | 5.19 % |
| 1985 | .00 | 2.58 % |
| 1986 | .00 | 0.23 % |
| 1987 | .00 | 6.62 % |
| 1988 | .01 | 38.54 % |
| 1989 | .01 | 6.03 % |
| 1990 | .01 | -8.16 % |
| 1991 | .01 | 7.62 % |
| 1992 | .01 | 2.80 % |
| 1993 | .01 | 1.87 % |
| 1994 | .01 | 2.11 % |
| 1995 | .01 | 0.55 % |
| 1996 | .01 | -0.27 % |
| 1997 | .01 | 7.57 % |
| 1998 | .01 | 0.00 % |
| 1999 | .01 | 0.00 % |
| 2000 | .01 | 3.58 % |
| 2001 | .01 | 3.09 % |
| 2002 | .01 | 45.51 % |
| 2003 | .01 | -2.47 % |
| 2004 | .01 | 3.63 % |
| 2005 | .01 | -1.55 % |
| 2006 | .02 | 32.34 % |
| 2007 | .01 | -16.38 % |
| 2008 | .01 | 10.01 % |
| 2009 | .02 | 8.22 % |
| 2010 | .01 | -15.76 % |
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