|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | .13 | NA |
| 1989 | .21 | 67.12 % |
| 1990 | .28 | 30.00 % |
| 1991 | .40 | 46.16 % |
| 1992 | .25 | -37.01 % |
| 1993 | .38 | 50.41 % |
| 1994 | .34 | -11.11 % |
| 1995 | .36 | 6.25 % |
| 1996 | .36 | -0.27 % |
| 1997 | .36 | 0.27 % |
| 1998 | .36 | 0.00 % |
| 1999 | .36 | 0.00 % |
| 2000 | .36 | -0.27 % |
| 2001 | .36 | 0.28 % |
| 2002 | .36 | 0.00 % |
| 2003 | .36 | 0.00 % |
| 2004 | .38 | 5.59 % |
| 2005 | .36 | -5.30 % |
| 2006 | .38 | 5.88 % |
| 2007 | | NA |
| 2008 | .00 | NA |
| 2009 | .01 | 49.76 % |
| 2010 | .01 | 0.00 % |
|
|