|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.96 | NA |
| 1987 | 1.39 | -29.17 % |
| 1988 | 3.31 | 138.23 % |
| 1989 | 2.86 | -13.58 % |
| 1990 | 3.54 | 23.57 % |
| 1991 | 3.41 | -3.47 % |
| 1992 | 2.87 | -15.80 % |
| 1993 | 3.02 | 4.96 % |
| 1994 | 3.02 | 0.00 % |
| 1995 | 3.02 | 0.00 % |
| 1996 | 3.02 | 0.00 % |
| 1997 | 3.08 | 2.03 % |
| 1998 | 3.13 | 1.60 % |
| 1999 | 3.13 | 0.00 % |
| 2000 | 3.16 | 1.03 % |
| 2001 | 3.23 | 2.21 % |
| 2002 | 3.27 | 1.27 % |
| 2003 | 3.29 | 0.63 % |
| 2004 | 3.32 | 0.97 % |
| 2005 | 3.37 | 1.50 % |
| 2006 | 3.43 | 1.82 % |
| 2007 | 3.19 | -7.14 % |
| 2008 | 3.58 | 12.23 % |
| 2009 | 3.51 | -1.98 % |
| 2010 | 3.52 | 0.23 % |
|
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