|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 7.97 | NA |
| 1987 | 6.42 | -19.44 % |
| 1988 | 8.83 | 37.60 % |
| 1989 | 9.60 | 8.68 % |
| 1990 | 9.14 | -4.84 % |
| 1991 | 8.66 | -5.25 % |
| 1992 | 8.71 | 0.62 % |
| 1993 | 8.43 | -3.22 % |
| 1994 | 8.79 | 4.27 % |
| 1995 | 8.49 | -3.37 % |
| 1996 | 9.97 | 17.41 % |
| 1997 | 10.70 | 7.30 % |
| 1998 | 10.54 | -1.46 % |
| 1999 | 10.35 | -1.81 % |
| 2000 | 10.14 | -2.09 % |
| 2001 | 9.45 | -6.75 % |
| 2002 | 9.32 | -1.35 % |
| 2003 | 11.87 | 27.32 % |
| 2004 | 12.89 | 8.56 % |
| 2005 | 9.93 | -22.94 % |
| 2006 | 10.31 | 3.76 % |
| 2007 | 12.50 | 21.32 % |
| 2008 | 11.52 | -7.85 % |
| 2009 | 14.61 | 26.77 % |
| 2010 | 17.99 | 23.20 % |
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