|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .52 | NA |
| 1987 | .59 | 13.47 % |
| 1988 | .82 | 37.80 % |
| 1989 | .94 | 14.82 % |
| 1990 | 1.08 | 14.89 % |
| 1991 | 1.20 | 10.99 % |
| 1992 | 1.34 | 11.60 % |
| 1993 | 1.29 | -3.12 % |
| 1994 | 1.03 | -20.73 % |
| 1995 | .72 | -29.38 % |
| 1996 | .72 | -0.27 % |
| 1997 | 2.44 | 237.42 % |
| 1998 | 2.79 | 14.42 % |
| 1999 | 3.20 | 14.82 % |
| 2000 | 3.16 | -1.21 % |
| 2001 | 3.36 | 6.25 % |
| 2002 | 3.55 | 5.72 % |
| 2003 | 3.75 | 5.54 % |
| 2004 | 4.06 | 8.19 % |
| 2005 | 4.22 | 4.09 % |
| 2006 | 4.17 | -1.18 % |
| 2007 | 4.16 | -0.24 % |
| 2008 | 3.91 | -6.11 % |
| 2009 | 4.12 | 5.38 % |
| 2010 | 4.12 | 0.02 % |
|
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