|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 18.00 | NA |
| 1993 | 18.88 | 4.91 % |
| 1994 | 21.02 | 11.32 % |
| 1995 | 28.74 | 36.74 % |
| 1996 | 24.17 | -15.90 % |
| 1997 | 24.81 | 2.64 % |
| 1998 | 24.69 | -0.49 % |
| 1999 | 27.16 | 10.02 % |
| 2000 | 27.56 | 1.45 % |
| 2001 | 29.00 | 5.24 % |
| 2002 | 31.91 | 10.01 % |
| 2003 | 32.15 | 0.77 % |
| 2004 | 35.22 | 9.55 % |
| 2005 | 35.32 | 0.27 % |
| 2006 | 37.40 | 5.90 % |
| 2007 | 38.44 | 2.78 % |
| 2008 | 38.06 | -1.01 % |
| 2009 | 36.63 | -3.76 % |
| 2010 | 35.25 | -3.74 % |
|
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