|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 8.69 | NA |
| 1987 | 7.97 | -8.24 % |
| 1988 | 9.59 | 20.30 % |
| 1989 | 8.45 | -11.92 % |
| 1990 | 10.32 | 22.13 % |
| 1991 | 8.88 | -13.92 % |
| 1992 | 9.16 | 3.16 % |
| 1993 | 9.92 | 8.28 % |
| 1994 | 9.86 | -0.57 % |
| 1995 | 8.56 | -13.23 % |
| 1996 | 12.12 | 41.67 % |
| 1997 | 10.51 | -13.27 % |
| 1998 | 11.19 | 6.44 % |
| 1999 | 14.71 | 31.43 % |
| 2000 | 15.05 | 2.32 % |
| 2001 | 17.20 | 14.32 % |
| 2002 | 16.83 | -2.16 % |
| 2003 | 16.31 | -3.08 % |
| 2004 | 16.29 | -0.12 % |
| 2005 | 17.25 | 5.87 % |
| 2006 | 20.31 | 17.74 % |
| 2007 | 16.37 | -19.42 % |
| 2008 | 26.66 | 62.91 % |
| 2009 | 27.01 | 1.30 % |
| 2010 | 27.83 | 3.04 % |
|
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