|
| 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 | 96.02 | NA |
| 1993 | 103.76 | 8.06 % |
| 1994 | 91.12 | -12.18 % |
| 1995 | 81.93 | -10.09 % |
| 1996 | 88.29 | 7.76 % |
| 1997 | 98.88 | 12.00 % |
| 1998 | 94.29 | -4.64 % |
| 1999 | 93.94 | -0.37 % |
| 2000 | 97.82 | 4.14 % |
| 2001 | 100.29 | 2.53 % |
| 2002 | 92.88 | -7.39 % |
| 2003 | 107.71 | 15.97 % |
| 2004 | 97.12 | -9.84 % |
| 2005 | 95.00 | -2.18 % |
| 2006 | 96.41 | 1.49 % |
| 2007 | 98.42 | 2.09 % |
| 2008 | 104.71 | 6.39 % |
| 2009 | 94.68 | -9.58 % |
| 2010 | 100.26 | 5.89 % |
| 2011 | 101.42 | 1.16 % |
|
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