|
| year | consumption | change |
| 1984 | 1.70 | NA |
| 1985 | 1.64 | -3.59 % |
| 1986 | 1.60 | -2.17 % |
| 1987 | 2.12 | 32.14 % |
| 1988 | 1.62 | -23.62 % |
| 1989 | 1.94 | 20.09 % |
| 1990 | 2.48 | 27.64 % |
| 1991 | 2.69 | 8.62 % |
| 1992 | 2.49 | -7.48 % |
| 1993 | 2.89 | 16.11 % |
| 1994 | 4.88 | 68.75 % |
| 1995 | 6.65 | 36.25 % |
| 1996 | 8.59 | 29.09 % |
| 1997 | 9.35 | 8.86 % |
| 1998 | 11.05 | 18.23 % |
| 1999 | 14.10 | 27.54 % |
| 2000 | 13.46 | -4.54 % |
| 2001 | 15.27 | 13.45 % |
| 2002 | 15.70 | 2.87 % |
| 2003 | 17.01 | 8.30 % |
| 2004 | 18.26 | 7.36 % |
| 2005 | 18.78 | 2.87 % |
| 2006 | 19.60 | 4.36 % |
| 2007 | 19.30 | -1.55 % |
| 2008 | 21.36 | 10.67 % |
| 2009 | 22.08 | 3.40 % |
| 2010 | 22.97 | 4.02 % |
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