|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 9.04 | NA |
| 1987 | 6.67 | -26.19 % |
| 1988 | 6.64 | -0.42 % |
| 1989 | 6.54 | -1.57 % |
| 1990 | 4.51 | -31.01 % |
| 1991 | 2.46 | -45.56 % |
| 1992 | 6.63 | 169.85 % |
| 1993 | 2.46 | -62.95 % |
| 1994 | 2.12 | -13.86 % |
| 1995 | 2.29 | 8.31 % |
| 1996 | 2.02 | -11.85 % |
| 1997 | 4.19 | 107.39 % |
| 1998 | 7.19 | 71.62 % |
| 1999 | 2.11 | -70.70 % |
| 2000 | 8.44 | 300.68 % |
| 2001 | 10.65 | 26.19 % |
| 2002 | 9.85 | -7.48 % |
| 2003 | 12.18 | 23.65 % |
| 2004 | 11.76 | -3.45 % |
| 2005 | 13.74 | 16.78 % |
| 2006 | 11.79 | -14.13 % |
| 2007 | 12.53 | 6.22 % |
| 2008 | 15.57 | 24.31 % |
| 2009 | 9.18 | -41.07 % |
| 2010 | 13.29 | 44.75 % |
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