|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.57 | NA |
| 1987 | 2.73 | 6.07 % |
| 1988 | 2.58 | -5.53 % |
| 1989 | 3.26 | 26.40 % |
| 1990 | 2.80 | -13.83 % |
| 1991 | 2.46 | -12.32 % |
| 1992 | 2.72 | 10.48 % |
| 1993 | 2.09 | -22.95 % |
| 1994 | 2.26 | 7.85 % |
| 1995 | 2.47 | 9.35 % |
| 1996 | 4.53 | 83.46 % |
| 1997 | 2.87 | -36.59 % |
| 1998 | 2.51 | -12.55 % |
| 1999 | 3.57 | 42.00 % |
| 2000 | 7.04 | 97.33 % |
| 2001 | 9.42 | 33.84 % |
| 2002 | 10.65 | 13.10 % |
| 2003 | 11.40 | 7.05 % |
| 2004 | 10.66 | -6.55 % |
| 2005 | 10.70 | 0.44 % |
| 2006 | 12.92 | 20.67 % |
| 2007 | 12.04 | -6.75 % |
| 2008 | 11.92 | -1.06 % |
| 2009 | 12.90 | 8.22 % |
| 2010 | 12.28 | -4.78 % |
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