|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.39 | NA |
| 1987 | 3.39 | 0.00 % |
| 1988 | 3.38 | -0.27 % |
| 1989 | 4.28 | 26.77 % |
| 1990 | 4.66 | 8.76 % |
| 1991 | 3.98 | -14.55 % |
| 1992 | 4.50 | 12.99 % |
| 1993 | 5.36 | 19.10 % |
| 1994 | 5.99 | 11.86 % |
| 1995 | 6.84 | 14.13 % |
| 1996 | 6.91 | 0.96 % |
| 1997 | 6.31 | -8.63 % |
| 1998 | 5.59 | -11.40 % |
| 1999 | 6.01 | 7.58 % |
| 2000 | 5.81 | -3.43 % |
| 2001 | 10.80 | 85.96 % |
| 2002 | 8.39 | -22.35 % |
| 2003 | 7.35 | -12.37 % |
| 2004 | 7.60 | 3.46 % |
| 2005 | 7.05 | -7.25 % |
| 2006 | 6.52 | -7.51 % |
| 2007 | 4.66 | -28.57 % |
| 2008 | 2.23 | -52.05 % |
| 2009 | .49 | -78.20 % |
| 2010 | 1.86 | 282.61 % |
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