|
| year | consumption | change |
| 1980 | .17 | NA |
| 1981 | .17 | -4.03 % |
| 1982 | .17 | 0.40 % |
| 1983 | .18 | 10.20 % |
| 1984 | .25 | 35.62 % |
| 1985 | .27 | 9.28 % |
| 1986 | .21 | -24.90 % |
| 1987 | .19 | -6.93 % |
| 1988 | .20 | 3.22 % |
| 1989 | .21 | 7.51 % |
| 1990 | .23 | 6.45 % |
| 1991 | .25 | 11.85 % |
| 1992 | .25 | -2.02 % |
| 1993 | .26 | 6.54 % |
| 1994 | .31 | 17.84 % |
| 1995 | .33 | 4.52 % |
| 1996 | .36 | 10.29 % |
| 1997 | .39 | 8.42 % |
| 1998 | .39 | -0.41 % |
| 1999 | .40 | 2.86 % |
| 2000 | .42 | 5.51 % |
| 2001 | .47 | 12.60 % |
| 2002 | .50 | 5.58 % |
| 2003 | .54 | 7.78 % |
| 2004 | .59 | 9.48 % |
| 2005 | .67 | 14.11 % |
| 2006 | .82 | 21.96 % |
| 2007 | .82 | 0.36 % |
| 2008 | .90 | 8.72 % |
| 2009 | .85 | -5.12 % |
| 2010 | .94 | 10.13 % |
|
|