|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 13.02 | NA |
| 1993 | 13.40 | 2.93 % |
| 1994 | 16.18 | 20.74 % |
| 1995 | 9.84 | -39.21 % |
| 1996 | 12.92 | 31.37 % |
| 1997 | 5.94 | -54.02 % |
| 1998 | 1.70 | -71.39 % |
| 1999 | 4.72 | 177.41 % |
| 2000 | 2.78 | -41.13 % |
| 2001 | 3.20 | 15.35 % |
| 2002 | 3.67 | 14.43 % |
| 2003 | 8.87 | 142.04 % |
| 2004 | 5.48 | -38.21 % |
| 2005 | 5.52 | 0.76 % |
| 2006 | 4.94 | -10.62 % |
| 2007 | 4.54 | -7.95 % |
| 2008 | 3.02 | -33.57 % |
| 2009 | 2.93 | -2.84 % |
| 2010 | 2.15 | -26.70 % |
|
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