|
| year | consumption | change |
| 1980 | .27 | NA |
| 1981 | .44 | 63.19 % |
| 1982 | .41 | -5.13 % |
| 1983 | .51 | 23.45 % |
| 1984 | .58 | 13.88 % |
| 1985 | .80 | 37.00 % |
| 1986 | .91 | 13.82 % |
| 1987 | 1.07 | 18.06 % |
| 1988 | 1.17 | 9.50 % |
| 1989 | 1.27 | 8.16 % |
| 1990 | 1.23 | -3.10 % |
| 1991 | 1.49 | 21.34 % |
| 1992 | 1.61 | 8.21 % |
| 1993 | 1.46 | -9.42 % |
| 1994 | 1.49 | 2.02 % |
| 1995 | 1.61 | 7.71 % |
| 1996 | 1.67 | 3.87 % |
| 1997 | 1.77 | 6.13 % |
| 1998 | 1.84 | 3.79 % |
| 1999 | 1.86 | 1.44 % |
| 2000 | 1.87 | 0.09 % |
| 2001 | 1.89 | 1.33 % |
| 2002 | 2.06 | 8.70 % |
| 2003 | 2.10 | 2.38 % |
| 2004 | 2.22 | 5.43 % |
| 2005 | 2.31 | 4.26 % |
| 2006 | 2.54 | 9.74 % |
| 2007 | 2.82 | 11.23 % |
| 2008 | 3.29 | 16.59 % |
| 2009 | 3.37 | 2.39 % |
| 2010 | 3.54 | 4.89 % |
|
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