|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 40.95 | NA |
| 1987 | 42.00 | 2.56 % |
| 1988 | 42.00 | 0.00 % |
| 1989 | 40.61 | -3.30 % |
| 1990 | 45.00 | 10.80 % |
| 1991 | 47.51 | 5.58 % |
| 1992 | 45.82 | -3.55 % |
| 1993 | 44.64 | -2.59 % |
| 1994 | 43.91 | -1.62 % |
| 1995 | 44.31 | 0.90 % |
| 1996 | 45.58 | 2.87 % |
| 1997 | 41.80 | -8.29 % |
| 1998 | 44.87 | 7.35 % |
| 1999 | 44.19 | -1.52 % |
| 2000 | 44.33 | 0.31 % |
| 2001 | 43.16 | -2.63 % |
| 2002 | 42.60 | -1.30 % |
| 2003 | 42.53 | -0.16 % |
| 2004 | 42.51 | -0.05 % |
| 2005 | 43.89 | 3.24 % |
| 2006 | 39.94 | -9.00 % |
| 2007 | 48.14 | 20.54 % |
| 2008 | 50.41 | 4.71 % |
| 2009 | 54.64 | 8.39 % |
| 2010 | 58.63 | 7.31 % |
|
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