|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 7.65 | NA |
| 1987 | 17.09 | 123.36 % |
| 1988 | 20.07 | 17.49 % |
| 1989 | 18.07 | -10.00 % |
| 1990 | 18.13 | 0.35 % |
| 1991 | 13.79 | -23.96 % |
| 1992 | 19.11 | 38.62 % |
| 1993 | 13.41 | -29.84 % |
| 1994 | 8.75 | -34.72 % |
| 1995 | 13.63 | 55.75 % |
| 1996 | 5.71 | -58.15 % |
| 1997 | 7.38 | 29.31 % |
| 1998 | 8.53 | 15.56 % |
| 1999 | 9.80 | 15.00 % |
| 2000 | 11.08 | 13.01 % |
| 2001 | 13.33 | 20.26 % |
| 2002 | 14.23 | 6.80 % |
| 2003 | 8.94 | -37.20 % |
| 2004 | 7.71 | -13.73 % |
| 2005 | 9.92 | 28.64 % |
| 2006 | 11.24 | 13.32 % |
| 2007 | 17.61 | 56.67 % |
| 2008 | 3.14 | -82.18 % |
| 2009 | 6.66 | 112.10 % |
| 2010 | 8.65 | 29.88 % |
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