|
| year | consumption | change |
| 1984 | 56.56 | NA |
| 1985 | 56.25 | -0.55 % |
| 1986 | 57.02 | 1.36 % |
| 1987 | 57.96 | 1.65 % |
| 1988 | 59.10 | 1.97 % |
| 1989 | 60.10 | 1.68 % |
| 1990 | 59.06 | -1.72 % |
| 1991 | 64.61 | 9.40 % |
| 1992 | 61.80 | -4.35 % |
| 1993 | 59.50 | -3.73 % |
| 1994 | 57.44 | -3.46 % |
| 1995 | 55.40 | -3.55 % |
| 1996 | 51.25 | -7.48 % |
| 1997 | 48.73 | -4.91 % |
| 1998 | 51.02 | 4.70 % |
| 1999 | 47.58 | -6.76 % |
| 2000 | 45.73 | -3.87 % |
| 2001 | 46.07 | 0.74 % |
| 2002 | 49.66 | 7.78 % |
| 2003 | 50.84 | 2.37 % |
| 2004 | 49.87 | -1.91 % |
| 2005 | 48.11 | -3.53 % |
| 2006 | 46.46 | -3.42 % |
| 2007 | 45.05 | -3.03 % |
| 2008 | 40.40 | -10.32 % |
| 2009 | 42.69 | 5.66 % |
| 2010 | 42.18 | -1.18 % |
|
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