|
| 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 | | NA |
| 1993 | 64.00 | NA |
| 1994 | 65.00 | 1.56 % |
| 1995 | 65.00 | 0.00 % |
| 1996 | 68.00 | 4.62 % |
| 1997 | 74.00 | 8.82 % |
| 1998 | 74.00 | 0.00 % |
| 1999 | 68.00 | -8.11 % |
| 2000 | 66.77 | -1.82 % |
| 2001 | 71.16 | 6.58 % |
| 2002 | 82.88 | 16.47 % |
| 2003 | 74.98 | -9.53 % |
| 2004 | 74.84 | -0.18 % |
| 2005 | 78.51 | 4.90 % |
| 2006 | 78.34 | -0.21 % |
| 2007 | 83.30 | 6.34 % |
| 2008 | 85.59 | 2.75 % |
| 2009 | 80.62 | -5.80 % |
| 2010 | 83.69 | 3.81 % |
| 2011 | 83.91 | 0.26 % |
|
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