|
| year | consumption | change |
| 1980 | .17 | NA |
| 1981 | .17 | -1.08 % |
| 1982 | .18 | 8.28 % |
| 1983 | .19 | 1.45 % |
| 1984 | .19 | 3.37 % |
| 1985 | .21 | 11.43 % |
| 1986 | .19 | -10.71 % |
| 1987 | .22 | 14.90 % |
| 1988 | .20 | -8.89 % |
| 1989 | .24 | 21.04 % |
| 1990 | .26 | 9.06 % |
| 1991 | .28 | 6.13 % |
| 1992 | .29 | 3.88 % |
| 1993 | .33 | 14.16 % |
| 1994 | .37 | 10.19 % |
| 1995 | .48 | 30.01 % |
| 1996 | .57 | 18.86 % |
| 1997 | .58 | 2.92 % |
| 1998 | .61 | 4.74 % |
| 1999 | .68 | 11.78 % |
| 2000 | .74 | 7.72 % |
| 2001 | .81 | 10.47 % |
| 2002 | .90 | 10.91 % |
| 2003 | .98 | 8.46 % |
| 2004 | 1.07 | 8.89 % |
| 2005 | 1.17 | 10.15 % |
| 2006 | 1.31 | 11.54 % |
| 2007 | 1.42 | 8.37 % |
| 2008 | 1.64 | 15.32 % |
| 2009 | 1.68 | 2.51 % |
| 2010 | 1.86 | 11.23 % |
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