|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 26.61 | NA |
| 1987 | 30.50 | 14.60 % |
| 1988 | 37.85 | 24.10 % |
| 1989 | 41.82 | 10.48 % |
| 1990 | 37.18 | -11.09 % |
| 1991 | 40.55 | 9.07 % |
| 1992 | 44.77 | 10.40 % |
| 1993 | 44.09 | -1.51 % |
| 1994 | 49.84 | 13.05 % |
| 1995 | 44.11 | -11.50 % |
| 1996 | 43.85 | -0.60 % |
| 1997 | 57.60 | 31.36 % |
| 1998 | 54.43 | -5.50 % |
| 1999 | 52.47 | -3.60 % |
| 2000 | 58.95 | 12.35 % |
| 2001 | 61.02 | 3.50 % |
| 2002 | 60.32 | -1.14 % |
| 2003 | 63.36 | 5.04 % |
| 2004 | 65.29 | 3.05 % |
| 2005 | 68.31 | 4.63 % |
| 2006 | 65.84 | -3.62 % |
| 2007 | 66.62 | 1.18 % |
| 2008 | 84.72 | 27.17 % |
| 2009 | 88.41 | 4.36 % |
| 2010 | 86.75 | -1.89 % |
|
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