|
| year | consumption | change |
| 1980 | 4.10 | NA |
| 1981 | 3.80 | -7.32 % |
| 1982 | 3.70 | -2.63 % |
| 1983 | | NA |
| 1984 | 4.70 | NA |
| 1985 | 4.40 | -6.38 % |
| 1986 | 3.60 | -18.18 % |
| 1987 | 3.54 | -1.63 % |
| 1988 | 3.69 | 4.06 % |
| 1989 | 4.26 | 15.58 % |
| 1990 | 4.19 | -1.54 % |
| 1991 | 6.74 | 60.61 % |
| 1992 | 4.80 | -28.75 % |
| 1993 | 3.62 | -24.54 % |
| 1994 | 4.15 | 14.52 % |
| 1995 | 4.13 | -0.45 % |
| 1996 | 4.16 | 0.86 % |
| 1997 | 4.34 | 4.34 % |
| 1998 | 4.34 | 0.00 % |
| 1999 | 6.81 | 56.82 % |
| 2000 | 9.47 | 38.94 % |
| 2001 | 6.82 | -27.98 % |
| 2002 | 8.80 | 29.11 % |
| 2003 | 14.20 | 61.32 % |
| 2004 | 15.13 | 6.54 % |
| 2005 | 14.93 | -1.29 % |
| 2006 | 15.57 | 4.26 % |
| 2007 | 16.74 | 7.51 % |
| 2008 | 8.82 | -47.28 % |
| 2009 | 9.22 | 4.46 % |
| 2010 | 9.77 | 6.02 % |
| 2011 | 26.00 | 166.04 % |
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