|
| year | consumption | change |
| 1980 | .40 | NA |
| 1981 | .43 | 6.52 % |
| 1982 | .43 | -0.30 % |
| 1983 | .40 | -6.48 % |
| 1984 | .41 | 2.68 % |
| 1985 | .42 | 1.59 % |
| 1986 | .45 | 7.42 % |
| 1987 | .46 | 1.23 % |
| 1988 | .45 | -0.35 % |
| 1989 | .41 | -10.27 % |
| 1990 | .38 | -5.41 % |
| 1991 | .38 | -0.82 % |
| 1992 | .38 | -1.51 % |
| 1993 | .40 | 5.68 % |
| 1994 | .45 | 13.81 % |
| 1995 | .47 | 4.80 % |
| 1996 | .50 | 6.24 % |
| 1997 | .49 | -3.47 % |
| 1998 | .50 | 3.49 % |
| 1999 | .51 | 1.98 % |
| 2000 | .53 | 3.06 % |
| 2001 | .54 | 1.71 % |
| 2002 | .55 | 1.56 % |
| 2003 | .56 | 2.05 % |
| 2004 | .58 | 4.56 % |
| 2005 | .62 | 6.23 % |
| 2006 | .68 | 9.33 % |
| 2007 | .68 | 1.20 % |
| 2008 | .76 | 11.37 % |
| 2009 | .75 | -1.92 % |
| 2010 | .85 | 13.34 % |
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