|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.23 | NA |
| 1987 | 2.40 | 7.23 % |
| 1988 | 2.00 | -16.40 % |
| 1989 | 4.42 | 120.67 % |
| 1990 | 3.39 | -23.27 % |
| 1991 | 3.39 | 0.03 % |
| 1992 | 3.82 | 12.50 % |
| 1993 | 3.74 | -1.87 % |
| 1994 | 3.81 | 1.64 % |
| 1995 | 3.74 | -1.61 % |
| 1996 | 3.75 | 0.27 % |
| 1997 | 3.76 | 0.27 % |
| 1998 | 3.79 | 0.54 % |
| 1999 | 3.79 | 0.00 % |
| 2000 | 3.88 | 2.42 % |
| 2001 | 3.90 | 0.70 % |
| 2002 | 3.82 | -2.09 % |
| 2003 | 4.03 | 5.35 % |
| 2004 | .90 | -77.73 % |
| 2005 | 3.99 | 344.40 % |
| 2006 | 7.95 | 99.49 % |
| 2007 | 7.87 | -1.03 % |
| 2008 | 8.03 | 2.08 % |
| 2009 | 8.05 | 0.18 % |
| 2010 | 8.05 | 0.00 % |
|
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