|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .93 | NA |
| 1987 | .96 | 2.48 % |
| 1988 | .72 | -24.38 % |
| 1989 | .89 | 22.58 % |
| 1990 | 1.15 | 28.94 % |
| 1991 | 1.08 | -6.11 % |
| 1992 | 1.05 | -2.33 % |
| 1993 | 1.07 | 1.90 % |
| 1994 | 1.03 | -3.93 % |
| 1995 | 1.05 | 2.14 % |
| 1996 | 1.08 | 2.38 % |
| 1997 | 1.08 | 0.00 % |
| 1998 | 1.05 | -2.33 % |
| 1999 | 1.00 | -4.30 % |
| 2000 | 1.03 | 2.33 % |
| 2001 | 1.52 | 47.73 % |
| 2002 | 2.15 | 41.22 % |
| 2003 | 2.13 | -0.86 % |
| 2004 | 1.82 | -14.29 % |
| 2005 | 1.36 | -25.64 % |
| 2006 | 1.57 | 15.52 % |
| 2007 | 1.45 | -7.46 % |
| 2008 | 1.11 | -23.41 % |
| 2009 | .98 | -11.55 % |
| 2010 | .89 | -9.52 % |
|
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