|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.03 | NA |
| 1987 | 1.78 | 73.44 % |
| 1988 | 1.98 | 11.44 % |
| 1989 | 1.86 | -6.38 % |
| 1990 | .93 | -49.66 % |
| 1991 | .93 | 0.00 % |
| 1992 | 1.24 | 32.99 % |
| 1993 | .98 | -21.05 % |
| 1994 | .93 | -4.76 % |
| 1995 | 1.39 | 49.18 % |
| 1996 | 1.81 | 29.79 % |
| 1997 | 1.89 | 4.36 % |
| 1998 | 2.17 | 15.06 % |
| 1999 | 2.20 | 1.08 % |
| 2000 | 2.38 | 8.34 % |
| 2001 | 2.39 | 0.27 % |
| 2002 | 2.41 | 0.86 % |
| 2003 | 2.48 | 2.91 % |
| 2004 | 2.59 | 4.43 % |
| 2005 | 2.66 | 2.98 % |
| 2006 | 2.78 | 4.39 % |
| 2007 | 4.18 | 50.42 % |
| 2008 | 5.30 | 26.82 % |
| 2009 | 5.33 | 0.44 % |
| 2010 | 2.85 | -46.49 % |
|
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