|
| year | consumption | change |
| 1984 | 1.40 | NA |
| 1985 | 1.62 | 15.75 % |
| 1986 | 1.92 | 18.61 % |
| 1987 | 1.77 | -7.70 % |
| 1988 | 1.80 | 1.73 % |
| 1989 | 1.42 | -21.00 % |
| 1990 | 1.60 | 12.12 % |
| 1991 | .47 | -70.50 % |
| 1992 | 1.27 | 169.61 % |
| 1993 | 1.62 | 27.88 % |
| 1994 | 1.73 | 6.58 % |
| 1995 | 1.77 | 2.06 % |
| 1996 | 1.26 | -28.88 % |
| 1997 | .79 | -37.44 % |
| 1998 | .23 | -70.73 % |
| 1999 | .13 | -42.86 % |
| 2000 | .07 | -50.14 % |
| 2001 | .07 | 0.27 % |
| 2002 | .03 | -49.99 % |
| 2003 | | NA |
| 2004 | | NA |
| 2005 | | NA |
| 2006 | .01 | NA |
| 2007 | -.01 | -233.33 % |
| 2008 | | NA |
| 2009 | | NA |
| 2010 | | NA |
|
|
