|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 8.84 | NA |
| 1987 | 10.50 | 18.75 % |
| 1988 | 9.57 | -8.85 % |
| 1989 | 9.49 | -0.86 % |
| 1990 | 10.64 | 12.13 % |
| 1991 | 8.75 | -17.80 % |
| 1992 | 10.27 | 17.45 % |
| 1993 | 7.81 | -23.92 % |
| 1994 | 7.20 | -7.87 % |
| 1995 | 6.79 | -5.63 % |
| 1996 | 5.70 | -16.07 % |
| 1997 | 5.77 | 1.10 % |
| 1998 | 5.21 | -9.64 % |
| 1999 | 5.25 | 0.81 % |
| 2000 | 2.24 | -57.37 % |
| 2001 | 1.55 | -30.94 % |
| 2002 | 1.16 | -24.66 % |
| 2003 | .59 | -49.09 % |
| 2004 | .61 | 3.29 % |
| 2005 | .74 | 21.02 % |
| 2006 | .49 | -34.28 % |
| 2007 | .44 | -8.70 % |
| 2008 | .17 | -61.91 % |
| 2009 | .23 | 37.50 % |
| 2010 | .93 | 300.00 % |
|
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