|
| year | consumption | change |
| 1980 | .13 | NA |
| 1981 | .13 | 1.04 % |
| 1982 | .14 | 2.63 % |
| 1983 | .13 | -2.37 % |
| 1984 | .13 | -2.11 % |
| 1985 | .13 | -1.01 % |
| 1986 | .13 | -0.31 % |
| 1987 | .12 | -7.36 % |
| 1988 | .12 | 1.85 % |
| 1989 | .10 | -15.59 % |
| 1990 | .11 | 7.85 % |
| 1991 | .11 | -3.50 % |
| 1992 | .11 | 4.44 % |
| 1993 | .10 | -7.98 % |
| 1994 | .10 | -3.01 % |
| 1995 | .10 | 1.08 % |
| 1996 | .10 | -3.81 % |
| 1997 | .11 | 9.56 % |
| 1998 | .10 | -4.59 % |
| 1999 | .10 | -2.80 % |
| 2000 | .10 | 0.15 % |
| 2001 | .10 | 5.67 % |
| 2002 | .11 | 2.98 % |
| 2003 | .11 | 4.21 % |
| 2004 | .11 | 1.91 % |
| 2005 | .12 | 5.88 % |
| 2006 | .13 | 4.60 % |
| 2007 | .13 | -0.45 % |
| 2008 | .13 | 0.62 % |
| 2009 | .13 | -1.49 % |
| 2010 | .14 | 9.45 % |
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