|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.25 | NA |
| 1987 | 1.33 | 6.56 % |
| 1988 | 2.10 | 58.03 % |
| 1989 | 2.36 | 12.46 % |
| 1990 | 2.23 | -5.64 % |
| 1991 | 2.29 | 2.75 % |
| 1992 | 2.14 | -6.51 % |
| 1993 | 2.21 | 3.14 % |
| 1994 | 2.25 | 1.85 % |
| 1995 | 2.21 | -1.82 % |
| 1996 | 2.20 | -0.27 % |
| 1997 | 2.41 | 9.56 % |
| 1998 | 2.41 | 0.00 % |
| 1999 | 2.41 | 0.00 % |
| 2000 | 2.47 | 2.26 % |
| 2001 | 2.53 | 2.76 % |
| 2002 | 3.84 | 51.42 % |
| 2003 | 3.52 | -8.23 % |
| 2004 | 3.87 | 9.97 % |
| 2005 | 3.82 | -1.31 % |
| 2006 | 3.60 | -5.88 % |
| 2007 | 3.86 | 7.39 % |
| 2008 | 3.96 | 2.52 % |
| 2009 | 4.23 | 6.86 % |
| 2010 | 3.60 | -15.01 % |
|
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