|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.04 | NA |
| 1987 | 1.06 | 2.04 % |
| 1988 | .79 | -25.66 % |
| 1989 | .91 | 15.23 % |
| 1990 | 1.04 | 14.35 % |
| 1991 | 1.39 | 33.59 % |
| 1992 | 2.20 | 58.52 % |
| 1993 | 1.19 | -45.81 % |
| 1994 | 1.23 | 3.20 % |
| 1995 | 1.19 | -3.45 % |
| 1996 | 1.11 | -6.41 % |
| 1997 | 1.01 | -9.28 % |
| 1998 | .94 | -6.55 % |
| 1999 | .91 | -3.23 % |
| 2000 | .82 | -9.55 % |
| 2001 | .72 | -12.58 % |
| 2002 | 1.02 | 41.18 % |
| 2003 | .64 | -37.50 % |
| 2004 | .91 | 42.94 % |
| 2005 | 1.02 | 11.93 % |
| 2006 | .89 | -12.50 % |
| 2007 | 1.69 | 90.48 % |
| 2008 | .72 | -57.50 % |
| 2009 | .36 | -50.00 % |
| 2010 | .93 | 158.82 % |
|
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