|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.16 | NA |
| 1987 | 1.12 | -64.45 % |
| 1988 | .71 | -36.57 % |
| 1989 | .72 | 0.28 % |
| 1990 | 2.64 | 269.23 % |
| 1991 | 3.13 | 18.45 % |
| 1992 | 2.81 | -10.05 % |
| 1993 | 2.84 | 1.00 % |
| 1994 | 2.86 | 0.72 % |
| 1995 | 2.88 | 0.71 % |
| 1996 | 2.82 | -2.08 % |
| 1997 | 2.86 | 1.45 % |
| 1998 | 2.88 | 0.77 % |
| 1999 | 2.88 | 0.00 % |
| 2000 | 2.73 | -5.54 % |
| 2001 | 2.89 | 6.21 % |
| 2002 | 2.89 | 0.00 % |
| 2003 | 3.15 | 8.79 % |
| 2004 | 3.53 | 12.03 % |
| 2005 | 3.57 | 1.16 % |
| 2006 | 3.78 | 6.00 % |
| 2007 | 3.78 | -0.04 % |
| 2008 | 3.78 | 0.00 % |
| 2009 | 3.78 | 0.04 % |
| 2010 | 3.80 | 0.39 % |
|
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