|
| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .06 | 7.10 % |
| 1982 | .06 | 8.44 % |
| 1983 | .06 | -3.30 % |
| 1984 | .05 | -7.35 % |
| 1985 | .06 | 13.21 % |
| 1986 | .07 | 11.89 % |
| 1987 | .07 | -2.63 % |
| 1988 | .07 | 7.19 % |
| 1989 | .07 | -4.19 % |
| 1990 | .07 | 0.09 % |
| 1991 | .09 | 35.24 % |
| 1992 | .09 | -6.52 % |
| 1993 | .08 | -13.50 % |
| 1994 | .08 | 0.29 % |
| 1995 | .07 | -5.74 % |
| 1996 | .07 | 0.88 % |
| 1997 | .07 | 2.05 % |
| 1998 | .07 | 0.41 % |
| 1999 | .08 | 8.02 % |
| 2000 | .11 | 35.70 % |
| 2001 | .14 | 25.57 % |
| 2002 | .14 | 3.20 % |
| 2003 | .15 | 10.00 % |
| 2004 | .16 | 7.15 % |
| 2005 | .18 | 7.23 % |
| 2006 | .20 | 11.22 % |
| 2007 | .19 | -2.48 % |
| 2008 | .21 | 10.70 % |
| 2009 | .29 | 38.28 % |
| 2010 | .31 | 4.89 % |
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