|
| 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 | .28 | NA |
| 1993 | .20 | -28.72 % |
| 1994 | .16 | -22.48 % |
| 1995 | .14 | -11.04 % |
| 1996 | .15 | 8.74 % |
| 1997 | .15 | 1.47 % |
| 1998 | .14 | -9.81 % |
| 1999 | .11 | -20.44 % |
| 2000 | .11 | -0.07 % |
| 2001 | .11 | -2.60 % |
| 2002 | .12 | 10.89 % |
| 2003 | .13 | 9.70 % |
| 2004 | .12 | -5.99 % |
| 2005 | .13 | 5.40 % |
| 2006 | .14 | 6.94 % |
| 2007 | .13 | -7.06 % |
| 2008 | .13 | 3.89 % |
| 2009 | .12 | -11.12 % |
| 2010 | .12 | -0.05 % |
|
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