|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.25 | NA |
| 1987 | 2.29 | 1.82 % |
| 1988 | 2.24 | -2.05 % |
| 1989 | 2.60 | 15.77 % |
| 1990 | 2.66 | 2.36 % |
| 1991 | 2.66 | 0.00 % |
| 1992 | 2.75 | 3.56 % |
| 1993 | 2.76 | 0.27 % |
| 1994 | 2.66 | -3.70 % |
| 1995 | 2.62 | -1.54 % |
| 1996 | 2.65 | 1.29 % |
| 1997 | 2.66 | 0.27 % |
| 1998 | 2.66 | 0.00 % |
| 1999 | 2.66 | 0.00 % |
| 2000 | 2.55 | -4.11 % |
| 2001 | 2.55 | 0.27 % |
| 2002 | 2.62 | 2.40 % |
| 2003 | 2.62 | 0.00 % |
| 2004 | 2.61 | -0.27 % |
| 2005 | 2.66 | 1.84 % |
| 2006 | 2.70 | 1.62 % |
| 2007 | 2.80 | 3.70 % |
| 2008 | 2.12 | -24.32 % |
| 2009 | 2.70 | 27.42 % |
| 2010 | 1.58 | -41.33 % |
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