|
| year | consumption | change |
| 1980 | .06 | NA |
| 1981 | .07 | 6.28 % |
| 1982 | .08 | 21.61 % |
| 1983 | .10 | 15.78 % |
| 1984 | .10 | 3.70 % |
| 1985 | .12 | 18.33 % |
| 1986 | .13 | 13.50 % |
| 1987 | .14 | 2.85 % |
| 1988 | .13 | -5.91 % |
| 1989 | .17 | 29.11 % |
| 1990 | .18 | 9.02 % |
| 1991 | .21 | 14.38 % |
| 1992 | .20 | -2.63 % |
| 1993 | .22 | 9.35 % |
| 1994 | .24 | 5.94 % |
| 1995 | .22 | -5.26 % |
| 1996 | .23 | 2.98 % |
| 1997 | .27 | 15.80 % |
| 1998 | .35 | 29.62 % |
| 1999 | .30 | -13.22 % |
| 2000 | .34 | 13.26 % |
| 2001 | .35 | 1.77 % |
| 2002 | .36 | 3.84 % |
| 2003 | .36 | -1.01 % |
| 2004 | .38 | 6.83 % |
| 2005 | .48 | 26.12 % |
| 2006 | .55 | 14.74 % |
| 2007 | .58 | 5.56 % |
| 2008 | .69 | 18.18 % |
| 2009 | .75 | 9.07 % |
| 2010 | .87 | 15.60 % |
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