|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.26 | NA |
| 1987 | 2.40 | 6.15 % |
| 1988 | 2.31 | -3.89 % |
| 1989 | 2.44 | 6.05 % |
| 1990 | 2.53 | 3.48 % |
| 1991 | 2.95 | 16.60 % |
| 1992 | 3.48 | 17.97 % |
| 1993 | 3.02 | -13.19 % |
| 1994 | 2.47 | -18.21 % |
| 1995 | 2.24 | -9.37 % |
| 1996 | 1.98 | -11.48 % |
| 1997 | 2.14 | 8.07 % |
| 1998 | 2.37 | 10.51 % |
| 1999 | 2.54 | 7.28 % |
| 2000 | 2.72 | 7.23 % |
| 2001 | 2.25 | -17.50 % |
| 2002 | 2.75 | 22.60 % |
| 2003 | 1.73 | -37.26 % |
| 2004 | 1.79 | 3.41 % |
| 2005 | 2.91 | 62.77 % |
| 2006 | 1.95 | -33.08 % |
| 2007 | 1.75 | -10.02 % |
| 2008 | 1.82 | 4.17 % |
| 2009 | 2.15 | 17.68 % |
| 2010 | 1.23 | -42.93 % |
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