|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.20 | NA |
| 1987 | 2.66 | 20.86 % |
| 1988 | 2.98 | 11.82 % |
| 1989 | 4.98 | 67.31 % |
| 1990 | 3.77 | -24.34 % |
| 1991 | 2.38 | -36.78 % |
| 1992 | 4.32 | 81.13 % |
| 1993 | 3.54 | -18.05 % |
| 1994 | 5.51 | 55.66 % |
| 1995 | 5.21 | -5.44 % |
| 1996 | 5.21 | 0.10 % |
| 1997 | 2.87 | -44.93 % |
| 1998 | 5.22 | 81.94 % |
| 1999 | 1.22 | -76.71 % |
| 2000 | 1.58 | 30.12 % |
| 2001 | 1.12 | -28.94 % |
| 2002 | 1.14 | 1.17 % |
| 2003 | 1.54 | 35.08 % |
| 2004 | 1.39 | -9.70 % |
| 2005 | 1.39 | 0.26 % |
| 2006 | 2.27 | 63.06 % |
| 2007 | .42 | -81.50 % |
| 2008 | 1.40 | 234.78 % |
| 2009 | .81 | -42.12 % |
| 2010 | 1.30 | 60.20 % |
|
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