|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .02 | 5.81 % |
| 1982 | .02 | -0.20 % |
| 1983 | .02 | 5.63 % |
| 1984 | .02 | -3.60 % |
| 1985 | .02 | 10.29 % |
| 1986 | .02 | 6.47 % |
| 1987 | .02 | -5.20 % |
| 1988 | .02 | -4.97 % |
| 1989 | .02 | 7.78 % |
| 1990 | .02 | 3.78 % |
| 1991 | .02 | 0.92 % |
| 1992 | .02 | 1.08 % |
| 1993 | .02 | -5.33 % |
| 1994 | .02 | 1.29 % |
| 1995 | .02 | 2.44 % |
| 1996 | .02 | -11.06 % |
| 1997 | .02 | 23.96 % |
| 1998 | .02 | 3.20 % |
| 1999 | .02 | 2.48 % |
| 2000 | .02 | 10.60 % |
| 2001 | .02 | -3.57 % |
| 2002 | .02 | 0.00 % |
| 2003 | .02 | 1.83 % |
| 2004 | .02 | -31.52 % |
| 2005 | .02 | 35.08 % |
| 2006 | .02 | -4.63 % |
| 2007 | .02 | -9.47 % |
| 2008 | .02 | -6.38 % |
| 2009 | .02 | 17.64 % |
| 2010 | .02 | -6.04 % |
|
|