|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | .10 | NA |
| 1990 | .13 | 29.36 % |
| 1991 | .15 | 18.17 % |
| 1992 | .15 | -4.97 % |
| 1993 | .12 | -16.15 % |
| 1994 | .15 | 22.90 % |
| 1995 | .15 | 0.00 % |
| 1996 | .15 | -0.28 % |
| 1997 | .15 | 0.28 % |
| 1998 | .15 | 0.00 % |
| 1999 | .15 | 0.00 % |
| 2000 | .15 | -0.98 % |
| 2001 | .15 | 0.00 % |
| 2002 | .15 | 0.00 % |
| 2003 | .15 | 0.00 % |
| 2004 | .15 | 0.00 % |
| 2005 | .15 | 0.00 % |
| 2006 | .20 | 30.70 % |
| 2007 | .19 | -2.78 % |
| 2008 | .21 | 10.29 % |
| 2009 | .19 | -11.55 % |
| 2010 | .19 | 0.00 % |
|
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