|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.91 | NA |
| 1987 | 4.09 | 40.67 % |
| 1988 | 4.12 | 0.76 % |
| 1989 | 4.63 | 12.33 % |
| 1990 | 4.92 | 6.34 % |
| 1991 | 4.57 | -7.10 % |
| 1992 | 2.53 | -44.54 % |
| 1993 | 2.75 | 8.63 % |
| 1994 | 2.75 | 0.00 % |
| 1995 | 5.51 | 100.00 % |
| 1996 | 6.34 | 15.07 % |
| 1997 | 2.84 | -55.21 % |
| 1998 | 2.92 | 2.98 % |
| 1999 | 2.16 | -26.09 % |
| 2000 | 2.53 | 17.33 % |
| 2001 | 2.56 | 1.11 % |
| 2002 | 2.31 | -9.92 % |
| 2003 | 2.27 | -1.84 % |
| 2004 | 2.30 | 1.59 % |
| 2005 | 2.31 | 0.27 % |
| 2006 | 2.08 | -10.09 % |
| 2007 | 2.05 | -1.02 % |
| 2008 | 2.24 | 9.28 % |
| 2009 | 2.67 | 18.87 % |
| 2010 | 2.39 | -10.32 % |
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