|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.10 | NA |
| 1987 | 1.00 | -9.59 % |
| 1988 | 1.18 | 18.80 % |
| 1989 | 1.04 | -12.26 % |
| 1990 | .90 | -13.11 % |
| 1991 | .97 | 7.44 % |
| 1992 | .46 | -52.04 % |
| 1993 | 1.21 | 159.80 % |
| 1994 | 1.23 | 1.75 % |
| 1995 | 1.27 | 3.45 % |
| 1996 | 1.27 | -0.27 % |
| 1997 | 1.29 | 1.95 % |
| 1998 | 1.29 | 0.00 % |
| 1999 | 1.29 | 0.00 % |
| 2000 | 1.61 | 24.25 % |
| 2001 | 1.52 | -5.00 % |
| 2002 | 1.59 | 4.17 % |
| 2003 | 1.72 | 8.00 % |
| 2004 | 1.73 | 0.96 % |
| 2005 | 1.84 | 6.39 % |
| 2006 | 1.76 | -4.60 % |
| 2007 | 2.37 | 34.94 % |
| 2008 | .71 | -70.12 % |
| 2009 | .62 | -12.17 % |
| 2010 | .73 | 17.66 % |
|
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