|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .92 | NA |
| 1987 | .29 | -68.54 % |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | .81 | NA |
| 1992 | .30 | -63.50 % |
| 1993 | .25 | -14.05 % |
| 1994 | | NA |
| 1995 | | NA |
| 1996 | | NA |
| 1997 | | NA |
| 1998 | 3.37 | NA |
| 1999 | 3.24 | -3.77 % |
| 2000 | 3.42 | 5.59 % |
| 2001 | 3.64 | 6.46 % |
| 2002 | 3.85 | 5.81 % |
| 2003 | 4.55 | 18.13 % |
| 2004 | 4.67 | 2.51 % |
| 2005 | 4.57 | -1.99 % |
| 2006 | 5.15 | 12.50 % |
| 2007 | 3.52 | -31.69 % |
| 2008 | 5.76 | 63.86 % |
| 2009 | 6.27 | 8.82 % |
| 2010 | 5.06 | -19.26 % |
|
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