|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .89 | NA |
| 1987 | .89 | 0.19 % |
| 1988 | .92 | 3.38 % |
| 1989 | .94 | 1.39 % |
| 1990 | .97 | 3.32 % |
| 1991 | .97 | 0.71 % |
| 1992 | .93 | -4.24 % |
| 1993 | .93 | 0.27 % |
| 1994 | 1.03 | 10.00 % |
| 1995 | 1.05 | 2.27 % |
| 1996 | 1.05 | -0.27 % |
| 1997 | 1.05 | 0.27 % |
| 1998 | 1.05 | 0.00 % |
| 1999 | 1.05 | 0.00 % |
| 2000 | 1.00 | -4.71 % |
| 2001 | 1.00 | 0.27 % |
| 2002 | 1.08 | 6.98 % |
| 2003 | 1.08 | 0.00 % |
| 2004 | 1.07 | -0.27 % |
| 2005 | 1.10 | 2.45 % |
| 2006 | 1.12 | 2.13 % |
| 2007 | 1.12 | 0.00 % |
| 2008 | 1.13 | 1.13 % |
| 2009 | 1.14 | 0.42 % |
| 2010 | 1.15 | 0.52 % |
|
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