|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | .26 | NA |
| 1993 | .19 | -24.74 % |
| 1994 | .10 | -46.44 % |
| 1995 | .18 | 69.03 % |
| 1996 | .11 | -35.06 % |
| 1997 | .16 | 39.54 % |
| 1998 | .19 | 16.59 % |
| 1999 | .19 | 2.79 % |
| 2000 | .22 | 16.89 % |
| 2001 | .22 | -1.10 % |
| 2002 | .23 | 4.74 % |
| 2003 | .23 | -1.83 % |
| 2004 | .25 | 11.44 % |
| 2005 | .27 | 7.55 % |
| 2006 | .28 | 2.18 % |
| 2007 | .26 | -6.64 % |
| 2008 | .29 | 11.91 % |
| 2009 | .30 | 3.94 % |
| 2010 | .33 | 7.50 % |
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