|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.46 | NA |
| 1987 | 3.01 | 22.22 % |
| 1988 | 3.13 | 3.96 % |
| 1989 | 3.23 | 3.19 % |
| 1990 | 3.76 | 16.38 % |
| 1991 | 3.54 | -5.83 % |
| 1992 | 3.95 | 11.55 % |
| 1993 | 4.60 | 16.45 % |
| 1994 | 4.84 | 5.16 % |
| 1995 | 4.80 | -0.75 % |
| 1996 | 4.91 | 2.38 % |
| 1997 | 4.80 | -2.33 % |
| 1998 | 5.13 | 6.89 % |
| 1999 | 5.73 | 11.70 % |
| 2000 | 5.35 | -6.63 % |
| 2001 | 5.31 | -0.75 % |
| 2002 | 5.69 | 7.22 % |
| 2003 | 5.36 | -5.77 % |
| 2004 | 5.50 | 2.50 % |
| 2005 | 5.38 | -2.10 % |
| 2006 | 5.46 | 1.36 % |
| 2007 | 5.20 | -4.68 % |
| 2008 | 2.85 | -45.26 % |
| 2009 | 3.46 | 21.64 % |
| 2010 | 5.46 | 57.56 % |
|
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