|
| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | -7.96 % |
| 1982 | .02 | 0.00 % |
| 1983 | .02 | 0.00 % |
| 1984 | .02 | 0.00 % |
| 1985 | .02 | 2.20 % |
| 1986 | .02 | 0.00 % |
| 1987 | .04 | 106.26 % |
| 1988 | .04 | -0.26 % |
| 1989 | .04 | 0.26 % |
| 1990 | .04 | 0.00 % |
| 1991 | .02 | -51.52 % |
| 1992 | .02 | -0.29 % |
| 1993 | .04 | 114.87 % |
| 1994 | .04 | 0.05 % |
| 1995 | .04 | 0.00 % |
| 1996 | .04 | -0.27 % |
| 1997 | .04 | 0.27 % |
| 1998 | .04 | 0.00 % |
| 1999 | .04 | 0.00 % |
| 2000 | .16 | 254.05 % |
| 2001 | .09 | -44.93 % |
| 2002 | .09 | 0.00 % |
| 2003 | .09 | 0.00 % |
| 2004 | .06 | -24.99 % |
| 2005 | .09 | 33.32 % |
| 2006 | .08 | -6.66 % |
| 2007 | .08 | 6.21 % |
| 2008 | .07 | -22.00 % |
| 2009 | .06 | -4.44 % |
| 2010 | .06 | 0.00 % |
| 2011 | | NA |
|
|