|
| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | -0.27 % |
| 1982 | .02 | 0.00 % |
| 1983 | .02 | 0.00 % |
| 1984 | .02 | 1.19 % |
| 1985 | .02 | -1.92 % |
| 1986 | .02 | 0.27 % |
| 1987 | .02 | 0.00 % |
| 1988 | .02 | -1.03 % |
| 1989 | .02 | 0.27 % |
| 1990 | .02 | -2.46 % |
| 1991 | .02 | 0.00 % |
| 1992 | .02 | 1.23 % |
| 1993 | .02 | -10.02 % |
| 1994 | .02 | 12.18 % |
| 1995 | .02 | 0.99 % |
| 1996 | .02 | 0.22 % |
| 1997 | .02 | 0.87 % |
| 1998 | .02 | 0.00 % |
| 1999 | .02 | 0.00 % |
| 2000 | .02 | 0.48 % |
| 2001 | .02 | 0.27 % |
| 2002 | .02 | 1.71 % |
| 2003 | .02 | 0.00 % |
| 2004 | .02 | -0.58 % |
| 2005 | .02 | -0.42 % |
| 2006 | .02 | 2.60 % |
| 2007 | .02 | 2.53 % |
| 2008 | .02 | -4.93 % |
| 2009 | .02 | 2.33 % |
| 2010 | .02 | -0.83 % |
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