|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.20 | NA |
| 1987 | 1.13 | -5.88 % |
| 1988 | 1.16 | 2.63 % |
| 1989 | 1.09 | -5.85 % |
| 1990 | 1.12 | 2.54 % |
| 1991 | 1.02 | -8.61 % |
| 1992 | 1.03 | 0.73 % |
| 1993 | .95 | -8.24 % |
| 1994 | .95 | 0.74 % |
| 1995 | .94 | -1.68 % |
| 1996 | 1.60 | 70.87 % |
| 1997 | .52 | -67.29 % |
| 1998 | .51 | -2.95 % |
| 1999 | .49 | -4.17 % |
| 2000 | .46 | -4.61 % |
| 2001 | .36 | -22.51 % |
| 2002 | .30 | -17.65 % |
| 2003 | .21 | -28.57 % |
| 2004 | .19 | -10.25 % |
| 2005 | .19 | 0.27 % |
| 2006 | .15 | -22.22 % |
| 2007 | .17 | 14.28 % |
| 2008 | .17 | -1.25 % |
| 2009 | .17 | 1.26 % |
| 2010 | .17 | 0.00 % |
|
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