|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 35.49 | NA |
| 1987 | 36.12 | 1.78 % |
| 1988 | 39.95 | 10.61 % |
| 1989 | 41.97 | 5.06 % |
| 1990 | 42.97 | 2.36 % |
| 1991 | 42.24 | -1.69 % |
| 1992 | 43.47 | 2.91 % |
| 1993 | 47.24 | 8.68 % |
| 1994 | 46.09 | -2.44 % |
| 1995 | 47.36 | 2.77 % |
| 1996 | 48.30 | 1.97 % |
| 1997 | 49.85 | 3.22 % |
| 1998 | 49.30 | -1.10 % |
| 1999 | 51.13 | 3.70 % |
| 2000 | 50.52 | -1.19 % |
| 2001 | 51.22 | 1.40 % |
| 2002 | 54.82 | 7.02 % |
| 2003 | 54.83 | 0.02 % |
| 2004 | 61.45 | 12.06 % |
| 2005 | 66.00 | 7.41 % |
| 2006 | 67.61 | 2.44 % |
| 2007 | 76.21 | 12.72 % |
| 2008 | 62.83 | -17.56 % |
| 2009 | 73.48 | 16.94 % |
| 2010 | 73.43 | -0.06 % |
|
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