|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | 2.90 | NA |
| 1989 | 3.10 | 6.90 % |
| 1990 | 5.08 | 63.87 % |
| 1991 | 4.90 | -3.54 % |
| 1992 | 4.86 | -0.86 % |
| 1993 | 5.00 | 2.89 % |
| 1994 | 6.14 | 22.85 % |
| 1995 | 6.35 | 3.48 % |
| 1996 | 6.65 | 4.71 % |
| 1997 | 4.55 | -31.56 % |
| 1998 | 4.49 | -1.40 % |
| 1999 | 4.17 | -7.08 % |
| 2000 | 4.35 | 4.28 % |
| 2001 | 4.24 | -2.65 % |
| 2002 | 4.07 | -4.01 % |
| 2003 | 4.68 | 15.12 % |
| 2004 | 4.39 | -6.14 % |
| 2005 | 4.47 | 1.72 % |
| 2006 | 4.45 | -0.47 % |
| 2007 | 4.60 | 3.33 % |
| 2008 | 4.93 | 7.37 % |
| 2009 | 4.74 | -3.86 % |
| 2010 | 4.34 | -8.48 % |
|
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