|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.50 | NA |
| 1987 | 2.90 | 16.06 % |
| 1988 | 3.40 | 17.19 % |
| 1989 | 3.97 | 16.91 % |
| 1990 | 3.90 | -1.86 % |
| 1991 | | NA |
| 1992 | 2.85 | NA |
| 1993 | 3.61 | 26.48 % |
| 1994 | 5.21 | 44.36 % |
| 1995 | 5.21 | 0.00 % |
| 1996 | 5.36 | 2.89 % |
| 1997 | 3.16 | -41.13 % |
| 1998 | 6.70 | 112.47 % |
| 1999 | 6.54 | -2.40 % |
| 2000 | 9.59 | 46.52 % |
| 2001 | 7.75 | -19.16 % |
| 2002 | 7.62 | -1.64 % |
| 2003 | 5.85 | -23.33 % |
| 2004 | 7.37 | 26.10 % |
| 2005 | 8.45 | 14.64 % |
| 2006 | 9.45 | 11.78 % |
| 2007 | 9.70 | 2.69 % |
| 2008 | 5.19 | -46.51 % |
| 2009 | 7.05 | 35.92 % |
| 2010 | 6.67 | -5.41 % |
|
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