|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | 1.71 | NA |
| 1988 | 2.08 | 21.74 % |
| 1989 | 2.26 | 8.47 % |
| 1990 | 2.37 | 5.11 % |
| 1991 | 2.72 | 14.74 % |
| 1992 | 2.09 | -23.13 % |
| 1993 | 2.99 | 43.00 % |
| 1994 | 3.05 | 1.83 % |
| 1995 | 3.07 | 0.60 % |
| 1996 | 3.06 | -0.27 % |
| 1997 | 3.10 | 1.47 % |
| 1998 | 3.10 | 0.00 % |
| 1999 | 3.10 | 0.00 % |
| 2000 | 3.18 | 2.66 % |
| 2001 | 3.23 | 1.42 % |
| 2002 | 3.25 | 0.57 % |
| 2003 | 3.38 | 3.93 % |
| 2004 | 3.46 | 2.42 % |
| 2005 | 3.65 | 5.55 % |
| 2006 | 4.01 | 10.00 % |
| 2007 | 5.47 | 36.36 % |
| 2008 | 5.57 | 1.67 % |
| 2009 | 1.90 | -65.90 % |
| 2010 | 1.90 | 0.00 % |
|
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