|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.08 | NA |
| 1987 | 5.27 | 3.77 % |
| 1988 | 5.06 | -4.14 % |
| 1989 | 5.06 | 0.06 % |
| 1990 | 5.40 | 6.75 % |
| 1991 | 5.54 | 2.58 % |
| 1992 | 5.49 | -0.88 % |
| 1993 | 5.51 | 0.27 % |
| 1994 | 4.21 | -23.46 % |
| 1995 | 3.88 | -8.04 % |
| 1996 | 2.47 | -36.24 % |
| 1997 | 2.50 | 1.13 % |
| 1998 | 4.64 | 85.59 % |
| 1999 | 4.38 | -5.48 % |
| 2000 | 4.84 | 10.33 % |
| 2001 | .85 | -82.48 % |
| 2002 | .85 | 0.00 % |
| 2003 | .85 | 0.00 % |
| 2004 | .82 | -2.77 % |
| 2005 | .68 | -17.72 % |
| 2006 | .53 | -21.88 % |
| 2007 | .64 | 20.00 % |
| 2008 | .66 | 3.33 % |
| 2009 | .51 | -22.58 % |
| 2010 | .49 | -4.17 % |
|
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