|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | 1.32 | NA |
| 1988 | 1.42 | 7.19 % |
| 1989 | 1.72 | 21.07 % |
| 1990 | 1.78 | 3.57 % |
| 1991 | 2.06 | 16.09 % |
| 1992 | 2.06 | -0.27 % |
| 1993 | 1.29 | -37.27 % |
| 1994 | 2.13 | 64.59 % |
| 1995 | 2.17 | 1.92 % |
| 1996 | 2.16 | -0.27 % |
| 1997 | 2.17 | 0.27 % |
| 1998 | 2.19 | 0.94 % |
| 1999 | 2.19 | 0.00 % |
| 2000 | 2.18 | -0.27 % |
| 2001 | 2.25 | 3.09 % |
| 2002 | 2.29 | 1.82 % |
| 2003 | 2.29 | 0.00 % |
| 2004 | 2.85 | 24.66 % |
| 2005 | 2.88 | 0.99 % |
| 2006 | 2.76 | -4.26 % |
| 2007 | 2.66 | -3.70 % |
| 2008 | 4.03 | 51.77 % |
| 2009 | 2.90 | -28.03 % |
| 2010 | 2.90 | 0.00 % |
|
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