|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.50 | NA |
| 1987 | 4.29 | -4.64 % |
| 1988 | 5.64 | 31.42 % |
| 1989 | 4.87 | -13.62 % |
| 1990 | 4.49 | -7.82 % |
| 1991 | 5.50 | 22.49 % |
| 1992 | 4.77 | -13.22 % |
| 1993 | 4.89 | 2.49 % |
| 1994 | 5.19 | 6.06 % |
| 1995 | 3.39 | -34.69 % |
| 1996 | 3.15 | -7.13 % |
| 1997 | 5.23 | 66.23 % |
| 1998 | 5.70 | 8.91 % |
| 1999 | 6.29 | 10.41 % |
| 2000 | 7.58 | 20.55 % |
| 2001 | 4.09 | -46.09 % |
| 2002 | 4.09 | 0.00 % |
| 2003 | 3.41 | -16.58 % |
| 2004 | 3.40 | -0.27 % |
| 2005 | 3.75 | 10.24 % |
| 2006 | 3.75 | 0.00 % |
| 2007 | .44 | -88.14 % |
| 2008 | .42 | -4.76 % |
| 2009 | .06 | -85.00 % |
| 2010 | .04 | -33.32 % |
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