|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .80 | NA |
| 1987 | .85 | 6.65 % |
| 1988 | .80 | -6.55 % |
| 1989 | .90 | 13.43 % |
| 1990 | .89 | -1.46 % |
| 1991 | .86 | -3.58 % |
| 1992 | .95 | 10.82 % |
| 1993 | .87 | -8.74 % |
| 1994 | .98 | 12.97 % |
| 1995 | 1.04 | 5.83 % |
| 1996 | 1.04 | -0.14 % |
| 1997 | 1.16 | 11.67 % |
| 1998 | 1.04 | -10.59 % |
| 1999 | .84 | -18.57 % |
| 2000 | 1.01 | 19.55 % |
| 2001 | .81 | -19.53 % |
| 2002 | .68 | -16.08 % |
| 2003 | 1.35 | 98.31 % |
| 2004 | 1.38 | 2.18 % |
| 2005 | 1.57 | 13.96 % |
| 2006 | 1.79 | 14.13 % |
| 2007 | 2.45 | 36.43 % |
| 2008 | 1.88 | -23.38 % |
| 2009 | 1.82 | -2.77 % |
| 2010 | 1.95 | 6.97 % |
|
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