|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.08 | NA |
| 1987 | .93 | -13.04 % |
| 1988 | 1.05 | 12.19 % |
| 1989 | 1.05 | 0.27 % |
| 1990 | 1.05 | 0.00 % |
| 1991 | 1.05 | 0.00 % |
| 1992 | 1.17 | 10.81 % |
| 1993 | 1.40 | 20.33 % |
| 1994 | 1.40 | 0.00 % |
| 1995 | 1.55 | 10.56 % |
| 1996 | 1.60 | 3.11 % |
| 1997 | 1.85 | 15.68 % |
| 1998 | 1.89 | 2.38 % |
| 1999 | 1.96 | 3.70 % |
| 2000 | 1.65 | -15.71 % |
| 2001 | 1.43 | -13.85 % |
| 2002 | 1.64 | 14.75 % |
| 2003 | 1.64 | 0.00 % |
| 2004 | 1.35 | -17.37 % |
| 2005 | 1.45 | 7.19 % |
| 2006 | 1.78 | 22.58 % |
| 2007 | 1.50 | -15.79 % |
| 2008 | 1.64 | 9.38 % |
| 2009 | 1.68 | 2.86 % |
| 2010 | 1.52 | -9.72 % |
|
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