|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | 3.20 | NA |
| 1988 | 3.25 | 1.59 % |
| 1989 | 3.37 | 3.73 % |
| 1990 | 3.41 | 1.30 % |
| 1991 | 3.54 | 3.78 % |
| 1992 | 3.77 | 6.40 % |
| 1993 | 3.74 | -0.56 % |
| 1994 | 3.47 | -7.23 % |
| 1995 | 3.74 | 7.73 % |
| 1996 | 3.53 | -5.68 % |
| 1997 | 3.80 | 7.72 % |
| 1998 | 4.15 | 9.08 % |
| 1999 | 4.20 | 1.19 % |
| 2000 | 1.72 | -58.91 % |
| 2001 | 1.96 | 13.82 % |
| 2002 | 4.25 | 116.46 % |
| 2003 | 5.14 | 20.89 % |
| 2004 | 4.62 | -10.01 % |
| 2005 | 4.91 | 6.16 % |
| 2006 | 1.96 | -60.00 % |
| 2007 | 2.45 | 25.00 % |
| 2008 | 2.01 | -18.10 % |
| 2009 | 3.58 | 77.91 % |
| 2010 | 3.58 | 0.00 % |
|
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