|
| year | consumption | change |
| 1984 | 17.93 | NA |
| 1985 | 17.80 | -0.69 % |
| 1986 | 15.45 | -13.19 % |
| 1987 | 17.56 | 13.63 % |
| 1988 | 16.51 | -6.00 % |
| 1989 | 17.02 | 3.10 % |
| 1990 | 11.64 | -31.63 % |
| 1991 | 15.58 | 33.88 % |
| 1992 | 12.19 | -21.74 % |
| 1993 | 12.06 | -1.05 % |
| 1994 | 13.32 | 10.40 % |
| 1995 | 6.30 | -52.71 % |
| 1996 | 8.53 | 35.38 % |
| 1997 | 9.25 | 8.47 % |
| 1998 | 7.14 | -22.78 % |
| 1999 | 2.77 | -61.26 % |
| 2000 | .11 | -95.85 % |
| 2001 | 2.96 | 2,478.56 % |
| 2002 | 1.88 | -36.39 % |
| 2003 | 2.42 | 28.68 % |
| 2004 | 1.77 | -27.01 % |
| 2005 | 2.79 | 57.62 % |
| 2006 | 2.39 | -14.06 % |
| 2007 | 1.51 | -36.96 % |
| 2008 | 5.03 | 233.39 % |
| 2009 | 6.02 | 19.60 % |
| 2010 | 11.83 | 96.59 % |
|
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