|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .86 | NA |
| 1987 | 1.25 | 44.90 % |
| 1988 | .99 | -20.59 % |
| 1989 | 1.25 | 26.07 % |
| 1990 | 1.29 | 3.11 % |
| 1991 | .91 | -29.78 % |
| 1992 | 1.18 | 30.49 % |
| 1993 | 1.28 | 8.47 % |
| 1994 | 1.63 | 27.21 % |
| 1995 | 1.75 | 7.19 % |
| 1996 | .64 | -63.50 % |
| 1997 | .91 | 42.87 % |
| 1998 | .89 | -2.28 % |
| 1999 | 1.64 | 83.54 % |
| 2000 | 1.71 | 4.37 % |
| 2001 | 1.53 | -10.40 % |
| 2002 | 1.39 | -8.92 % |
| 2003 | .93 | -33.00 % |
| 2004 | 1.15 | 22.70 % |
| 2005 | 1.23 | 7.62 % |
| 2006 | 1.03 | -16.55 % |
| 2007 | .40 | -60.97 % |
| 2008 | .54 | 34.46 % |
| 2009 | .51 | -5.34 % |
| 2010 | .86 | 67.86 % |
|
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