|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 44.88 | NA |
| 1987 | 40.58 | -9.57 % |
| 1988 | 40.04 | -1.35 % |
| 1989 | 39.00 | -2.60 % |
| 1990 | 42.00 | 7.71 % |
| 1991 | 43.87 | 4.46 % |
| 1992 | 41.43 | -5.58 % |
| 1993 | 42.77 | 3.24 % |
| 1994 | 48.49 | 13.38 % |
| 1995 | 48.55 | 0.12 % |
| 1996 | 51.84 | 6.79 % |
| 1997 | 51.32 | -1.01 % |
| 1998 | 57.22 | 11.50 % |
| 1999 | 65.24 | 14.01 % |
| 2000 | 56.40 | -13.55 % |
| 2001 | 55.40 | -1.76 % |
| 2002 | 80.44 | 45.18 % |
| 2003 | 55.49 | -31.01 % |
| 2004 | 52.87 | -4.73 % |
| 2005 | 60.25 | 13.97 % |
| 2006 | 64.10 | 6.38 % |
| 2007 | 60.47 | -5.66 % |
| 2008 | 60.78 | 0.51 % |
| 2009 | 69.61 | 14.52 % |
| 2010 | 71.97 | 3.39 % |
|
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