|
| year | consumption | change |
| 1984 | 1.48 | NA |
| 1985 | 2.66 | 80.16 % |
| 1986 | 3.14 | 17.90 % |
| 1987 | 3.27 | 4.10 % |
| 1988 | 3.30 | 0.98 % |
| 1989 | 3.37 | 2.10 % |
| 1990 | 3.31 | -1.87 % |
| 1991 | 3.53 | 6.71 % |
| 1992 | 3.71 | 5.07 % |
| 1993 | 3.72 | 0.27 % |
| 1994 | 3.75 | 0.88 % |
| 1995 | 3.79 | 1.02 % |
| 1996 | 3.87 | 2.11 % |
| 1997 | 3.85 | -0.50 % |
| 1998 | 3.44 | -10.75 % |
| 1999 | 3.31 | -3.75 % |
| 2000 | 3.61 | 9.23 % |
| 2001 | 4.16 | 15.14 % |
| 2002 | 4.38 | 5.40 % |
| 2003 | 4.39 | 0.06 % |
| 2004 | 5.01 | 14.30 % |
| 2005 | 5.01 | 0.00 % |
| 2006 | 5.37 | 7.16 % |
| 2007 | 5.56 | 3.52 % |
| 2008 | 5.45 | -2.04 % |
| 2009 | 5.31 | -2.49 % |
| 2010 | 4.80 | -9.64 % |
|
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