|
| year | consumption | change |
| 1984 | .35 | NA |
| 1985 | .30 | -15.39 % |
| 1986 | .23 | -22.22 % |
| 1987 | .22 | -5.95 % |
| 1988 | .13 | -39.41 % |
| 1989 | .12 | -10.17 % |
| 1990 | .07 | -44.19 % |
| 1991 | .07 | 0.00 % |
| 1992 | .04 | -37.67 % |
| 1993 | .03 | -19.77 % |
| 1994 | .04 | 8.33 % |
| 1995 | .03 | -7.69 % |
| 1996 | | NA |
| 1997 | | NA |
| 1998 | | NA |
| 1999 | | NA |
| 2000 | | NA |
| 2001 | | NA |
| 2002 | | NA |
| 2003 | | NA |
| 2004 | | NA |
| 2005 | | NA |
| 2006 | | NA |
| 2007 | | NA |
| 2008 | | NA |
| 2009 | | NA |
| 2010 | | NA |
|
|
