|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 15.85 | NA |
| 1993 | 11.15 | -29.66 % |
| 1994 | 10.14 | -9.01 % |
| 1995 | 14.65 | 44.47 % |
| 1996 | 15.06 | 2.75 % |
| 1997 | 15.17 | 0.74 % |
| 1998 | 14.82 | -2.31 % |
| 1999 | 11.54 | -22.08 % |
| 2000 | 14.86 | 28.70 % |
| 2001 | 23.37 | 57.29 % |
| 2002 | 16.92 | -27.60 % |
| 2003 | 7.20 | -57.46 % |
| 2004 | 6.41 | -10.96 % |
| 2005 | 8.95 | 39.65 % |
| 2006 | 10.03 | 12.01 % |
| 2007 | 9.49 | -5.36 % |
| 2008 | 8.04 | -15.27 % |
| 2009 | 6.19 | -22.97 % |
| 2010 | 4.56 | -26.42 % |
|
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