|
| year | consumption | change |
| 1984 | 1.22 | NA |
| 1985 | 1.57 | 29.12 % |
| 1986 | 2.24 | 42.93 % |
| 1987 | 3.95 | 76.19 % |
| 1988 | 4.27 | 7.95 % |
| 1989 | 4.75 | 11.38 % |
| 1990 | 4.33 | -8.88 % |
| 1991 | 4.56 | 5.19 % |
| 1992 | 4.23 | -7.17 % |
| 1993 | 4.42 | 4.48 % |
| 1994 | 3.68 | -16.80 % |
| 1995 | 1.75 | -52.31 % |
| 1996 | 1.43 | -18.19 % |
| 1997 | .70 | -50.91 % |
| 1998 | .12 | -83.66 % |
| 1999 | .09 | -21.43 % |
| 2000 | .10 | 8.79 % |
| 2001 | .12 | 22.56 % |
| 2002 | .12 | -4.55 % |
| 2003 | .10 | -14.29 % |
| 2004 | .07 | -33.52 % |
| 2005 | .05 | -24.78 % |
| 2006 | .05 | 0.00 % |
| 2007 | .02 | -66.67 % |
| 2008 | .03 | 99.45 % |
| 2009 | .07 | 100.52 % |
| 2010 | .03 | -49.99 % |
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