|
| 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 | .12 | NA |
| 1993 | .12 | 0.58 % |
| 1994 | .11 | -7.08 % |
| 1995 | .12 | 3.01 % |
| 1996 | .13 | 8.46 % |
| 1997 | .12 | -2.02 % |
| 1998 | .14 | 14.21 % |
| 1999 | .13 | -7.75 % |
| 2000 | .12 | -10.85 % |
| 2001 | .11 | -7.54 % |
| 2002 | .11 | 0.22 % |
| 2003 | .12 | 8.44 % |
| 2004 | .12 | 2.12 % |
| 2005 | .12 | 0.95 % |
| 2006 | .12 | -1.75 % |
| 2007 | .11 | -2.58 % |
| 2008 | .11 | -0.35 % |
| 2009 | .11 | -0.77 % |
| 2010 | .12 | 6.87 % |
|
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