|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.24 | NA |
| 1987 | 3.00 | -7.23 % |
| 1988 | 3.29 | 9.57 % |
| 1989 | 2.57 | -21.79 % |
| 1990 | 1.37 | -46.81 % |
| 1991 | .64 | -53.33 % |
| 1992 | .64 | -0.27 % |
| 1993 | .66 | 3.14 % |
| 1994 | .66 | 0.00 % |
| 1995 | .66 | 0.00 % |
| 1996 | .69 | 5.27 % |
| 1997 | .69 | 0.27 % |
| 1998 | .69 | 0.00 % |
| 1999 | .69 | 0.00 % |
| 2000 | .69 | -0.27 % |
| 2001 | .82 | 18.75 % |
| 2002 | .86 | 4.44 % |
| 2003 | .89 | 4.25 % |
| 2004 | .91 | 1.76 % |
| 2005 | .89 | -1.73 % |
| 2006 | .64 | -28.57 % |
| 2007 | .88 | 37.14 % |
| 2008 | .84 | -4.17 % |
| 2009 | .82 | -2.17 % |
| 2010 | .82 | 0.00 % |
|
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