|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .42 | NA |
| 1987 | .47 | 10.00 % |
| 1988 | .51 | 8.79 % |
| 1989 | .47 | -8.08 % |
| 1990 | .42 | -9.09 % |
| 1991 | .20 | -51.75 % |
| 1992 | .25 | 24.00 % |
| 1993 | .46 | 80.85 % |
| 1994 | .23 | -49.18 % |
| 1995 | .44 | 88.17 % |
| 1996 | .42 | -3.64 % |
| 1997 | .23 | -46.73 % |
| 1998 | .25 | 12.95 % |
| 1999 | .28 | 8.34 % |
| 2000 | .25 | -7.95 % |
| 2001 | .19 | -24.79 % |
| 2002 | .19 | 0.00 % |
| 2003 | .70 | 266.67 % |
| 2004 | .23 | -66.76 % |
| 2005 | .21 | -8.84 % |
| 2006 | | NA |
| 2007 | .19 | NA |
| 2008 | .15 | -22.22 % |
| 2009 | .13 | -14.29 % |
| 2010 | .13 | 0.00 % |
|
|