|
| year | consumption | change |
| 1980 | .27 | NA |
| 1981 | .29 | 5.51 % |
| 1982 | .30 | 2.11 % |
| 1983 | .33 | 13.13 % |
| 1984 | .37 | 10.28 % |
| 1985 | .38 | 4.51 % |
| 1986 | .38 | -0.27 % |
| 1987 | .43 | 13.23 % |
| 1988 | .45 | 4.16 % |
| 1989 | .48 | 6.58 % |
| 1990 | .56 | 16.63 % |
| 1991 | .52 | -7.42 % |
| 1992 | .54 | 3.22 % |
| 1993 | .55 | 1.38 % |
| 1994 | .63 | 16.21 % |
| 1995 | .61 | -3.86 % |
| 1996 | .65 | 7.07 % |
| 1997 | .69 | 6.56 % |
| 1998 | .75 | 8.28 % |
| 1999 | .77 | 2.81 % |
| 2000 | .78 | 1.09 % |
| 2001 | .76 | -2.54 % |
| 2002 | .82 | 7.54 % |
| 2003 | .83 | 0.88 % |
| 2004 | .85 | 2.21 % |
| 2005 | .80 | -4.83 % |
| 2006 | .81 | 0.26 % |
| 2007 | .81 | 0.07 % |
| 2008 | .82 | 1.33 % |
| 2009 | .95 | 15.91 % |
| 2010 | 1.03 | 8.90 % |
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