|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 10.00 | NA |
| 1993 | 10.91 | 9.12 % |
| 1994 | 12.78 | 17.08 % |
| 1995 | 18.62 | 45.76 % |
| 1996 | 25.93 | 39.23 % |
| 1997 | 27.26 | 5.16 % |
| 1998 | 25.70 | -5.74 % |
| 1999 | 25.83 | 0.52 % |
| 2000 | 24.42 | -5.48 % |
| 2001 | 25.75 | 5.46 % |
| 2002 | 26.37 | 2.38 % |
| 2003 | 26.88 | 1.94 % |
| 2004 | 29.17 | 8.52 % |
| 2005 | 31.15 | 6.79 % |
| 2006 | 31.72 | 1.84 % |
| 2007 | 31.99 | 0.84 % |
| 2008 | 39.16 | 22.43 % |
| 2009 | 33.72 | -13.88 % |
| 2010 | 34.05 | 0.97 % |
|
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