|
| 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 | 35.42 | NA |
| 1993 | 22.86 | -35.46 % |
| 1994 | 19.66 | -14.00 % |
| 1995 | 19.10 | -2.84 % |
| 1996 | 18.37 | -3.82 % |
| 1997 | 18.45 | 0.41 % |
| 1998 | 20.74 | 12.43 % |
| 1999 | 21.36 | 3.00 % |
| 2000 | 19.23 | -9.97 % |
| 2001 | 19.28 | 0.27 % |
| 2002 | 20.13 | 4.37 % |
| 2003 | 21.77 | 8.16 % |
| 2004 | 24.94 | 14.57 % |
| 2005 | 26.05 | 4.43 % |
| 2006 | 25.78 | -1.01 % |
| 2007 | 26.05 | 1.05 % |
| 2008 | 27.25 | 4.60 % |
| 2009 | 27.75 | 1.83 % |
| 2010 | 28.58 | 2.98 % |
| 2011 | 35.00 | 22.46 % |
|
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