|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.27 | NA |
| 1987 | 1.23 | -3.23 % |
| 1988 | 1.47 | 19.67 % |
| 1989 | 1.41 | -3.90 % |
| 1990 | 1.49 | 5.80 % |
| 1991 | 1.53 | 2.74 % |
| 1992 | 2.96 | 92.81 % |
| 1993 | 2.96 | 0.27 % |
| 1994 | 3.07 | 3.45 % |
| 1995 | 3.11 | 1.33 % |
| 1996 | 3.10 | -0.27 % |
| 1997 | 3.11 | 0.27 % |
| 1998 | 4.80 | 54.61 % |
| 1999 | 3.11 | -35.32 % |
| 2000 | 4.02 | 29.25 % |
| 2001 | 3.82 | -4.82 % |
| 2002 | 3.88 | 1.60 % |
| 2003 | 3.99 | 2.63 % |
| 2004 | 4.10 | 2.80 % |
| 2005 | 4.21 | 2.77 % |
| 2006 | 4.31 | 2.43 % |
| 2007 | 4.44 | 2.84 % |
| 2008 | 4.54 | 2.30 % |
| 2009 | 4.66 | 2.70 % |
| 2010 | 4.70 | 0.88 % |
|
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