|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.79 | NA |
| 1987 | 4.05 | 6.74 % |
| 1988 | 3.68 | -9.02 % |
| 1989 | 4.05 | 9.92 % |
| 1990 | 4.49 | 10.83 % |
| 1991 | 3.70 | -17.60 % |
| 1992 | 1.21 | -67.22 % |
| 1993 | 1.26 | 4.13 % |
| 1994 | 1.33 | 5.56 % |
| 1995 | 1.26 | -5.27 % |
| 1996 | 1.24 | -2.12 % |
| 1997 | 1.24 | 0.27 % |
| 1998 | 1.22 | -1.89 % |
| 1999 | 1.15 | -5.77 % |
| 2000 | .93 | -18.59 % |
| 2001 | .82 | -12.26 % |
| 2002 | .96 | 17.14 % |
| 2003 | 1.24 | 29.27 % |
| 2004 | 1.38 | 11.02 % |
| 2005 | 1.57 | 13.87 % |
| 2006 | 1.96 | 25.37 % |
| 2007 | 2.13 | 8.33 % |
| 2008 | 2.31 | 8.79 % |
| 2009 | 2.38 | 3.03 % |
| 2010 | 3.32 | 39.22 % |
|
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