|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.45 | NA |
| 1987 | 2.48 | -28.04 % |
| 1988 | 2.39 | -3.73 % |
| 1989 | 2.25 | -5.85 % |
| 1990 | 2.30 | 2.30 % |
| 1991 | 2.15 | -6.58 % |
| 1992 | 2.00 | -7.18 % |
| 1993 | 1.96 | -1.77 % |
| 1994 | 2.02 | 3.12 % |
| 1995 | 2.04 | 1.01 % |
| 1996 | 2.04 | -0.27 % |
| 1997 | 2.04 | 0.27 % |
| 1998 | 2.04 | 0.00 % |
| 1999 | 2.04 | 0.00 % |
| 2000 | 1.94 | -5.26 % |
| 2001 | 1.94 | 0.27 % |
| 2002 | 2.41 | 24.21 % |
| 2003 | 2.51 | 4.24 % |
| 2004 | 2.59 | 2.97 % |
| 2005 | 2.72 | 5.01 % |
| 2006 | 3.09 | 13.53 % |
| 2007 | 3.07 | -0.66 % |
| 2008 | 3.40 | 10.95 % |
| 2009 | 3.00 | -11.82 % |
| 2010 | 3.07 | 2.21 % |
|
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