|
| year | consumption | change |
| 1980 | .44 | NA |
| 1981 | .46 | 4.77 % |
| 1982 | .49 | 5.96 % |
| 1983 | .49 | -0.61 % |
| 1984 | .51 | 5.42 % |
| 1985 | .50 | -3.06 % |
| 1986 | .57 | 14.88 % |
| 1987 | .63 | 10.79 % |
| 1988 | .68 | 6.73 % |
| 1989 | .73 | 8.33 % |
| 1990 | .80 | 9.75 % |
| 1991 | .86 | 6.87 % |
| 1992 | .97 | 13.37 % |
| 1993 | .97 | -0.80 % |
| 1994 | 1.17 | 21.30 % |
| 1995 | 1.19 | 1.50 % |
| 1996 | 1.36 | 13.99 % |
| 1997 | 1.46 | 7.30 % |
| 1998 | 1.50 | 3.35 % |
| 1999 | 1.49 | -0.94 % |
| 2000 | 1.53 | 2.44 % |
| 2001 | 1.62 | 6.17 % |
| 2002 | 1.60 | -1.15 % |
| 2003 | 1.69 | 5.62 % |
| 2004 | 1.90 | 12.45 % |
| 2005 | 2.04 | 7.03 % |
| 2006 | 2.08 | 2.29 % |
| 2007 | 2.26 | 8.50 % |
| 2008 | 2.53 | 11.96 % |
| 2009 | 2.89 | 14.35 % |
| 2010 | 3.37 | 16.53 % |
|
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