|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 2.20 | NA |
| 1993 | 1.19 | -45.79 % |
| 1994 | 1.25 | 4.85 % |
| 1995 | 1.09 | -12.50 % |
| 1996 | 1.36 | 24.57 % |
| 1997 | 1.72 | 25.93 % |
| 1998 | 2.38 | 38.89 % |
| 1999 | 2.67 | 12.00 % |
| 2000 | 2.92 | 9.22 % |
| 2001 | 2.76 | -5.18 % |
| 2002 | 2.73 | -1.14 % |
| 2003 | 2.80 | 2.32 % |
| 2004 | 2.63 | -5.94 % |
| 2005 | 2.70 | 2.69 % |
| 2006 | 2.64 | -2.35 % |
| 2007 | 2.67 | 1.20 % |
| 2008 | 2.70 | 1.19 % |
| 2009 | 2.54 | -5.88 % |
| 2010 | 2.70 | 6.25 % |
|
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