|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 83.93 | NA |
| 1993 | 76.02 | -9.43 % |
| 1994 | 78.27 | 2.95 % |
| 1995 | 73.15 | -6.54 % |
| 1996 | 65.52 | -10.43 % |
| 1997 | 66.51 | 1.51 % |
| 1998 | 70.55 | 6.08 % |
| 1999 | 61.96 | -12.17 % |
| 2000 | 56.53 | -8.77 % |
| 2001 | 54.64 | -3.35 % |
| 2002 | 53.04 | -2.93 % |
| 2003 | 51.56 | -2.78 % |
| 2004 | 55.07 | 6.81 % |
| 2005 | 68.35 | 24.11 % |
| 2006 | 73.05 | 6.87 % |
| 2007 | 74.15 | 1.51 % |
| 2008 | 67.67 | -8.73 % |
| 2009 | 57.01 | -15.75 % |
| 2010 | 56.98 | -0.06 % |
| 2011 | 81.00 | 42.16 % |
|
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