|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.58 | NA |
| 1987 | 4.56 | -0.42 % |
| 1988 | 3.07 | -32.68 % |
| 1989 | 3.46 | 12.66 % |
| 1990 | 3.41 | -1.35 % |
| 1991 | 3.10 | -9.09 % |
| 1992 | 3.48 | 12.23 % |
| 1993 | 4.04 | 16.20 % |
| 1994 | 4.49 | 10.98 % |
| 1995 | 4.91 | 9.38 % |
| 1996 | 4.17 | -14.99 % |
| 1997 | 5.96 | 42.85 % |
| 1998 | 7.17 | 20.39 % |
| 1999 | 7.20 | 0.33 % |
| 2000 | 7.97 | 10.74 % |
| 2001 | 7.41 | -7.06 % |
| 2002 | 7.85 | 5.99 % |
| 2003 | 8.88 | 13.10 % |
| 2004 | 9.18 | 3.40 % |
| 2005 | 9.39 | 2.31 % |
| 2006 | 8.81 | -6.22 % |
| 2007 | 8.60 | -2.39 % |
| 2008 | 8.60 | 0.00 % |
| 2009 | 8.93 | 3.80 % |
| 2010 | 11.87 | 32.98 % |
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