|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.11 | NA |
| 1987 | 3.04 | -26.04 % |
| 1988 | 3.83 | 26.07 % |
| 1989 | 4.37 | 14.00 % |
| 1990 | 4.06 | -7.13 % |
| 1991 | 4.86 | 19.73 % |
| 1992 | 4.99 | 2.60 % |
| 1993 | 5.14 | 3.09 % |
| 1994 | 5.28 | 2.73 % |
| 1995 | 4.53 | -14.16 % |
| 1996 | 4.59 | 1.27 % |
| 1997 | 5.49 | 19.62 % |
| 1998 | 5.19 | -5.53 % |
| 1999 | 3.65 | -29.73 % |
| 2000 | 3.71 | 1.64 % |
| 2001 | 2.59 | -30.00 % |
| 2002 | 2.38 | -8.11 % |
| 2003 | 2.41 | 0.98 % |
| 2004 | 2.42 | 0.70 % |
| 2005 | 2.64 | 8.95 % |
| 2006 | 2.41 | -8.85 % |
| 2007 | 3.81 | 58.25 % |
| 2008 | 4.49 | 17.79 % |
| 2009 | 4.63 | 3.13 % |
| 2010 | 4.79 | 3.54 % |
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