|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.13 | NA |
| 1987 | 6.56 | 27.69 % |
| 1988 | 4.86 | -25.82 % |
| 1989 | 5.84 | 20.05 % |
| 1990 | 4.51 | -22.81 % |
| 1991 | 4.92 | 9.24 % |
| 1992 | 6.13 | 24.59 % |
| 1993 | 4.32 | -29.56 % |
| 1994 | 11.01 | 154.79 % |
| 1995 | 8.95 | -18.72 % |
| 1996 | 6.84 | -23.60 % |
| 1997 | 7.89 | 15.42 % |
| 1998 | 8.37 | 6.08 % |
| 1999 | 16.44 | 96.40 % |
| 2000 | 9.32 | -43.29 % |
| 2001 | 10.78 | 15.65 % |
| 2002 | 7.47 | -30.74 % |
| 2003 | 14.67 | 96.52 % |
| 2004 | 24.23 | 65.14 % |
| 2005 | 20.53 | -15.28 % |
| 2006 | 17.88 | -12.91 % |
| 2007 | 20.98 | 17.32 % |
| 2008 | 15.38 | -26.68 % |
| 2009 | 16.10 | 4.66 % |
| 2010 | 18.72 | 16.29 % |
|
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