|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .38 | NA |
| 1987 | .38 | 0.00 % |
| 1988 | .38 | -0.27 % |
| 1989 | .38 | 0.27 % |
| 1990 | .38 | 0.00 % |
| 1991 | .38 | 0.00 % |
| 1992 | .39 | 1.50 % |
| 1993 | .40 | 2.83 % |
| 1994 | .41 | 2.50 % |
| 1995 | .41 | 0.00 % |
| 1996 | .41 | 0.00 % |
| 1997 | .41 | 0.00 % |
| 1998 | .40 | -2.44 % |
| 1999 | .40 | 0.00 % |
| 2000 | .50 | 25.00 % |
| 2001 | .50 | 0.00 % |
| 2002 | .50 | 0.00 % |
| 2003 | .50 | 0.00 % |
| 2004 | .50 | 0.00 % |
| 2005 | .50 | 0.00 % |
| 2006 | .51 | 2.83 % |
| 2007 | .55 | 6.97 % |
| 2008 | .62 | 13.27 % |
| 2009 | .51 | -17.47 % |
| 2010 | 1.66 | 223.54 % |
|
|