|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | .99 | NA |
| 1993 | .77 | -22.77 % |
| 1994 | .76 | -0.53 % |
| 1995 | .73 | -4.01 % |
| 1996 | .65 | -11.75 % |
| 1997 | .64 | -1.20 % |
| 1998 | .54 | -14.66 % |
| 1999 | .56 | 3.51 % |
| 2000 | .52 | -7.70 % |
| 2001 | .52 | 0.10 % |
| 2002 | .59 | 13.69 % |
| 2003 | .60 | 1.65 % |
| 2004 | .64 | 5.89 % |
| 2005 | .66 | 3.44 % |
| 2006 | .70 | 6.05 % |
| 2007 | .59 | -15.22 % |
| 2008 | .72 | 21.27 % |
| 2009 | .57 | -21.12 % |
| 2010 | .56 | -1.95 % |
|
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