|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 28.99 | NA |
| 1987 | 27.91 | -3.74 % |
| 1988 | 29.30 | 5.00 % |
| 1989 | 28.68 | -2.12 % |
| 1990 | 30.98 | 8.01 % |
| 1991 | 31.73 | 2.42 % |
| 1992 | 34.32 | 8.16 % |
| 1993 | 31.39 | -8.53 % |
| 1994 | 30.44 | -3.04 % |
| 1995 | 29.35 | -3.56 % |
| 1996 | 30.56 | 4.11 % |
| 1997 | 32.22 | 5.43 % |
| 1998 | 32.60 | 1.19 % |
| 1999 | 29.70 | -8.89 % |
| 2000 | 34.03 | 14.56 % |
| 2001 | 34.71 | 2.00 % |
| 2002 | 40.57 | 16.90 % |
| 2003 | 41.86 | 3.17 % |
| 2004 | 37.90 | -9.46 % |
| 2005 | 38.84 | 2.49 % |
| 2006 | 46.37 | 19.37 % |
| 2007 | 46.88 | 1.12 % |
| 2008 | 62.65 | 33.64 % |
| 2009 | 39.71 | -36.63 % |
| 2010 | 54.76 | 37.90 % |
|
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