|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 8.57 | NA |
| 1993 | 9.58 | 11.73 % |
| 1994 | 9.13 | -4.71 % |
| 1995 | 5.80 | -36.43 % |
| 1996 | 8.43 | 45.28 % |
| 1997 | 9.04 | 7.24 % |
| 1998 | 9.67 | 6.97 % |
| 1999 | 6.83 | -29.33 % |
| 2000 | 2.69 | -60.61 % |
| 2001 | 13.18 | 389.52 % |
| 2002 | 2.43 | -81.59 % |
| 2003 | 1.87 | -23.04 % |
| 2004 | 2.06 | 10.09 % |
| 2005 | 2.41 | 17.18 % |
| 2006 | 5.53 | 129.55 % |
| 2007 | 5.49 | -0.66 % |
| 2008 | 4.20 | -23.59 % |
| 2009 | 4.23 | 0.87 % |
| 2010 | 3.87 | -8.62 % |
|
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