|
| year | consumption | change |
| 1984 | .28 | NA |
| 1985 | .26 | -8.40 % |
| 1986 | .37 | 41.05 % |
| 1987 | .39 | 7.46 % |
| 1988 | .37 | -7.20 % |
| 1989 | .42 | 15.99 % |
| 1990 | .60 | 41.93 % |
| 1991 | .21 | -65.45 % |
| 1992 | .19 | -9.46 % |
| 1993 | .12 | -34.60 % |
| 1994 | .24 | 97.78 % |
| 1995 | .13 | -44.94 % |
| 1996 | .18 | 32.29 % |
| 1997 | .20 | 11.07 % |
| 1998 | .26 | 33.33 % |
| 1999 | .31 | 16.67 % |
| 2000 | .13 | -57.26 % |
| 2001 | .10 | -24.80 % |
| 2002 | .08 | -22.22 % |
| 2003 | .11 | 42.86 % |
| 2004 | .09 | -20.22 % |
| 2005 | .10 | 12.81 % |
| 2006 | .09 | -11.11 % |
| 2007 | .07 | -25.00 % |
| 2008 | .07 | -0.27 % |
| 2009 | .07 | 0.27 % |
| 2010 | | NA |
|
|