|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | -1.75 % |
| 1982 | .01 | 1.63 % |
| 1983 | .01 | 0.07 % |
| 1984 | .01 | 2.40 % |
| 1985 | .01 | -11.88 % |
| 1986 | .02 | 29.14 % |
| 1987 | .02 | 4.75 % |
| 1988 | .02 | 2.21 % |
| 1989 | .02 | -2.80 % |
| 1990 | .02 | 31.29 % |
| 1991 | .02 | -20.49 % |
| 1992 | .02 | 2.24 % |
| 1993 | .02 | -5.80 % |
| 1994 | .02 | 11.71 % |
| 1995 | .02 | -0.27 % |
| 1996 | .02 | 1.02 % |
| 1997 | .02 | 4.99 % |
| 1998 | .02 | 1.62 % |
| 1999 | .02 | 4.28 % |
| 2000 | .02 | 3.82 % |
| 2001 | .02 | 7.77 % |
| 2002 | .02 | 2.00 % |
| 2003 | .02 | -7.73 % |
| 2004 | .02 | 7.07 % |
| 2005 | .02 | -0.21 % |
| 2006 | .02 | -2.21 % |
| 2007 | .02 | 1.65 % |
| 2008 | .02 | 3.54 % |
| 2009 | .02 | 0.74 % |
| 2010 | .02 | 0.08 % |
|
|