|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | | NA |
| 1994 | 1.84 | NA |
| 1995 | 2.20 | 19.22 % |
| 1996 | 2.30 | 4.55 % |
| 1997 | 2.40 | 4.70 % |
| 1998 | 2.53 | 5.38 % |
| 1999 | 2.74 | 8.06 % |
| 2000 | 2.26 | -17.39 % |
| 2001 | 2.39 | 5.69 % |
| 2002 | 2.17 | -9.40 % |
| 2003 | 2.60 | 19.81 % |
| 2004 | 2.32 | -10.48 % |
| 2005 | 2.00 | -13.80 % |
| 2006 | 1.88 | -6.12 % |
| 2007 | 1.86 | -1.09 % |
| 2008 | 1.06 | -42.86 % |
| 2009 | 1.55 | 46.15 % |
| 2010 | 1.53 | -1.32 % |
|
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