|
| year | consumption | change |
| 1980 | .80 | NA |
| 1981 | .70 | -12.50 % |
| 1982 | .70 | 0.00 % |
| 1983 | .70 | 0.00 % |
| 1984 | .70 | 0.00 % |
| 1985 | .76 | 8.75 % |
| 1986 | .76 | 0.05 % |
| 1987 | .72 | -5.47 % |
| 1988 | .86 | 19.25 % |
| 1989 | .77 | -10.35 % |
| 1990 | .81 | 4.74 % |
| 1991 | .67 | -16.52 % |
| 1992 | .44 | -34.74 % |
| 1993 | .44 | 0.27 % |
| 1994 | .44 | 0.01 % |
| 1995 | .44 | 0.00 % |
| 1996 | .44 | -0.27 % |
| 1997 | .44 | 0.27 % |
| 1998 | .44 | 0.00 % |
| 1999 | .44 | 0.00 % |
| 2000 | .56 | 28.16 % |
| 2001 | .57 | 0.27 % |
| 2002 | .61 | 7.74 % |
| 2003 | .61 | 0.00 % |
| 2004 | .63 | 3.07 % |
| 2005 | .67 | 6.78 % |
| 2006 | .65 | -2.61 % |
| 2007 | .76 | 16.45 % |
| 2008 | .68 | -11.13 % |
| 2009 | .84 | 23.84 % |
| 2010 | .84 | 0.00 % |
| 2011 | | NA |
|
|