|
| year | consumption | change |
| 1984 | .57 | NA |
| 1985 | .72 | 26.18 % |
| 1986 | .63 | -12.55 % |
| 1987 | .57 | -10.00 % |
| 1988 | .40 | -28.70 % |
| 1989 | .28 | -29.54 % |
| 1990 | .25 | -11.54 % |
| 1991 | .29 | 14.13 % |
| 1992 | .34 | 19.67 % |
| 1993 | .24 | -29.97 % |
| 1994 | .33 | 36.36 % |
| 1995 | .24 | -26.67 % |
| 1996 | .20 | -18.41 % |
| 1997 | .22 | 11.42 % |
| 1998 | .26 | 20.00 % |
| 1999 | .28 | 7.29 % |
| 2000 | .30 | 7.47 % |
| 2001 | .35 | 14.73 % |
| 2002 | .26 | -24.41 % |
| 2003 | .37 | 40.63 % |
| 2004 | .33 | -11.35 % |
| 2005 | .35 | 6.96 % |
| 2006 | .42 | 18.75 % |
| 2007 | .20 | -52.63 % |
| 2008 | .17 | -11.36 % |
| 2009 | .15 | -12.26 % |
| 2010 | .15 | 0.00 % |
|
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