|
| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .05 | 10.69 % |
| 1982 | .06 | 15.93 % |
| 1983 | .06 | -0.40 % |
| 1984 | .06 | 1.53 % |
| 1985 | .06 | 4.51 % |
| 1986 | .07 | 9.37 % |
| 1987 | .07 | -4.89 % |
| 1988 | .07 | -0.27 % |
| 1989 | .08 | 16.48 % |
| 1990 | .08 | 0.58 % |
| 1991 | .08 | 1.12 % |
| 1992 | .08 | 0.31 % |
| 1993 | .06 | -24.12 % |
| 1994 | .07 | 24.69 % |
| 1995 | .08 | 2.40 % |
| 1996 | .08 | -0.43 % |
| 1997 | .08 | 5.25 % |
| 1998 | .08 | 0.01 % |
| 1999 | .08 | -2.24 % |
| 2000 | .08 | 3.96 % |
| 2001 | .08 | 0.41 % |
| 2002 | .08 | -4.37 % |
| 2003 | .08 | 7.42 % |
| 2004 | .09 | 3.42 % |
| 2005 | .09 | -1.12 % |
| 2006 | .10 | 15.20 % |
| 2007 | .10 | 0.21 % |
| 2008 | .11 | 6.70 % |
| 2009 | .11 | 2.76 % |
| 2010 | .12 | 15.01 % |
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