|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.14 | NA |
| 1987 | 1.03 | -9.96 % |
| 1988 | .53 | -47.93 % |
| 1989 | .47 | -12.47 % |
| 1990 | .50 | 6.48 % |
| 1991 | .47 | -6.09 % |
| 1992 | .47 | -0.27 % |
| 1993 | .51 | 10.30 % |
| 1994 | .47 | -9.09 % |
| 1995 | .61 | 30.00 % |
| 1996 | .63 | 3.56 % |
| 1997 | .96 | 52.27 % |
| 1998 | 1.24 | 29.26 % |
| 1999 | 1.29 | 3.78 % |
| 2000 | 3.10 | 141.16 % |
| 2001 | 3.13 | 1.03 % |
| 2002 | 3.20 | 2.24 % |
| 2003 | 3.27 | 2.19 % |
| 2004 | 3.38 | 3.29 % |
| 2005 | 3.37 | -0.42 % |
| 2006 | 3.48 | 3.47 % |
| 2007 | 3.39 | -2.68 % |
| 2008 | .98 | -71.03 % |
| 2009 | 1.00 | 2.38 % |
| 2010 | 1.00 | 0.00 % |
|
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