|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 12.06 % |
| 1982 | .01 | -11.00 % |
| 1983 | .01 | -21.06 % |
| 1984 | .01 | -7.06 % |
| 1985 | .01 | 130.74 % |
| 1986 | .02 | 49.92 % |
| 1987 | .02 | 1.61 % |
| 1988 | .02 | 29.14 % |
| 1989 | .02 | -14.16 % |
| 1990 | .02 | 3.85 % |
| 1991 | .02 | 3.07 % |
| 1992 | .04 | 77.09 % |
| 1993 | .04 | 2.01 % |
| 1994 | .04 | 2.56 % |
| 1995 | .04 | 0.22 % |
| 1996 | .04 | 0.12 % |
| 1997 | .04 | -0.12 % |
| 1998 | .05 | 15.40 % |
| 1999 | .04 | -12.89 % |
| 2000 | .09 | 122.58 % |
| 2001 | .05 | -45.21 % |
| 2002 | .05 | 1.76 % |
| 2003 | .05 | 2.57 % |
| 2004 | .05 | 2.60 % |
| 2005 | .06 | 2.82 % |
| 2006 | .06 | 2.32 % |
| 2007 | .06 | 3.06 % |
| 2008 | .06 | 2.55 % |
| 2009 | .06 | 2.64 % |
| 2010 | .06 | 1.64 % |
|
|