|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.57 | NA |
| 1987 | 2.60 | 1.51 % |
| 1988 | 2.35 | -9.63 % |
| 1989 | .80 | -66.14 % |
| 1990 | .81 | 1.27 % |
| 1991 | .57 | -29.80 % |
| 1992 | 5.22 | 820.75 % |
| 1993 | 3.90 | -25.30 % |
| 1994 | 5.78 | 48.37 % |
| 1995 | 6.19 | 7.03 % |
| 1996 | 6.19 | 0.04 % |
| 1997 | 5.74 | -7.23 % |
| 1998 | 6.01 | 4.73 % |
| 1999 | 7.33 | 21.83 % |
| 2000 | 9.31 | 27.11 % |
| 2001 | 7.22 | -22.46 % |
| 2002 | 5.78 | -19.94 % |
| 2003 | 6.63 | 14.65 % |
| 2004 | 7.27 | 9.60 % |
| 2005 | 7.20 | -0.89 % |
| 2006 | 7.12 | -1.18 % |
| 2007 | 6.90 | -2.98 % |
| 2008 | 6.99 | 1.23 % |
| 2009 | 6.90 | -1.21 % |
| 2010 | 7.07 | 2.45 % |
|
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