|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.38 | NA |
| 1987 | 3.42 | 1.17 % |
| 1988 | 3.40 | -0.57 % |
| 1989 | 3.52 | 3.53 % |
| 1990 | 3.62 | 2.93 % |
| 1991 | 3.60 | -0.64 % |
| 1992 | 4.00 | 11.09 % |
| 1993 | 4.19 | 4.84 % |
| 1994 | 4.26 | 1.52 % |
| 1995 | 4.85 | 13.93 % |
| 1996 | 4.75 | -2.02 % |
| 1997 | 4.47 | -5.97 % |
| 1998 | 4.45 | -0.47 % |
| 1999 | 3.96 | -10.95 % |
| 2000 | 4.75 | 19.99 % |
| 2001 | 4.66 | -1.95 % |
| 2002 | 4.85 | 4.09 % |
| 2003 | 4.19 | -13.54 % |
| 2004 | 3.87 | -7.83 % |
| 2005 | 4.41 | 13.97 % |
| 2006 | 3.45 | -21.63 % |
| 2007 | 3.58 | 3.68 % |
| 2008 | 3.20 | -10.65 % |
| 2009 | 2.77 | -13.24 % |
| 2010 | 3.49 | 25.95 % |
|
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