|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.54 | NA |
| 1987 | 1.96 | 27.45 % |
| 1988 | 1.66 | -15.71 % |
| 1989 | 1.99 | 20.23 % |
| 1990 | 2.03 | 1.85 % |
| 1991 | 2.10 | 3.73 % |
| 1992 | 1.36 | -35.23 % |
| 1993 | 1.64 | 20.50 % |
| 1994 | .96 | -41.74 % |
| 1995 | 1.42 | 49.00 % |
| 1996 | 1.42 | -0.27 % |
| 1997 | 1.48 | 4.20 % |
| 1998 | 1.48 | 0.02 % |
| 1999 | 1.48 | 0.00 % |
| 2000 | 1.52 | 2.33 % |
| 2001 | 1.55 | 2.35 % |
| 2002 | 1.52 | -1.94 % |
| 2003 | 1.54 | 1.28 % |
| 2004 | 1.68 | 8.97 % |
| 2005 | 1.85 | 10.11 % |
| 2006 | 1.33 | -27.78 % |
| 2007 | 1.37 | 2.53 % |
| 2008 | 1.39 | 1.33 % |
| 2009 | .42 | -69.74 % |
| 2010 | .42 | 0.00 % |
|
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