|
| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 1.10 | 0.00 % |
| 1982 | 1.10 | 0.00 % |
| 1983 | 1.10 | 0.00 % |
| 1984 | 1.10 | 0.00 % |
| 1985 | 1.10 | 0.00 % |
| 1986 | 1.10 | 0.00 % |
| 1987 | 1.10 | 0.00 % |
| 1988 | 1.10 | 0.00 % |
| 1989 | 2.20 | 100.00 % |
| 1990 | 2.20 | 0.00 % |
| 1991 | .02 | -99.00 % |
| 1992 | | NA |
| 1993 | | NA |
| 1994 | | NA |
| 1995 | .28 | NA |
| 1996 | 13.04 | 4,631.96 % |
| 1997 | .35 | -97.30 % |
| 1998 | .51 | 43.75 % |
| 1999 | .46 | -8.70 % |
| 2000 | .50 | 7.14 % |
| 2001 | .71 | 42.85 % |
| 2002 | 31.40 | 4,332.15 % |
| 2003 | 84.96 | 170.52 % |
| 2004 | 67.31 | -20.77 % |
| 2005 | 33.07 | -50.87 % |
| 2006 | 67.17 | 103.13 % |
| 2007 | 137.79 | 105.12 % |
| 2008 | 134.00 | -2.75 % |
| 2009 | 116.38 | -13.15 % |
| 2010 | 103.90 | -10.72 % |
| 2011 | 107.87 | 3.82 % |
|
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