|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.03 | NA |
| 1987 | 1.92 | -5.75 % |
| 1988 | 1.93 | 0.94 % |
| 1989 | 1.99 | 2.69 % |
| 1990 | 1.92 | -3.53 % |
| 1991 | 1.18 | -38.41 % |
| 1992 | .98 | -17.07 % |
| 1993 | .98 | 0.12 % |
| 1994 | .98 | 0.00 % |
| 1995 | .98 | 0.00 % |
| 1996 | .98 | 0.00 % |
| 1997 | .98 | 0.00 % |
| 1998 | .98 | 0.00 % |
| 1999 | .98 | 0.00 % |
| 2000 | | NA |
| 2001 | | NA |
| 2002 | | NA |
| 2003 | | NA |
| 2004 | | NA |
| 2005 | .93 | NA |
| 2006 | .82 | -12.50 % |
| 2007 | .91 | 11.43 % |
| 2008 | .79 | -12.82 % |
| 2009 | .79 | 0.00 % |
| 2010 | .79 | 0.00 % |
|
|