|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.97 | NA |
| 1987 | 3.25 | 9.24 % |
| 1988 | 2.84 | -12.53 % |
| 1989 | 4.62 | 62.57 % |
| 1990 | 4.03 | -12.69 % |
| 1991 | 4.09 | 1.49 % |
| 1992 | 5.94 | 45.30 % |
| 1993 | 5.08 | -14.47 % |
| 1994 | 2.00 | -60.72 % |
| 1995 | 3.30 | 65.51 % |
| 1996 | 3.77 | 14.02 % |
| 1997 | 12.00 | 218.51 % |
| 1998 | 14.00 | 16.67 % |
| 1999 | .66 | -95.30 % |
| 2000 | 14.01 | 2,027.11 % |
| 2001 | 15.12 | 7.93 % |
| 2002 | 18.34 | 21.30 % |
| 2003 | 19.97 | 8.90 % |
| 2004 | 20.98 | 5.06 % |
| 2005 | 21.05 | 0.31 % |
| 2006 | 22.66 | 7.67 % |
| 2007 | | NA |
| 2008 | 21.77 | NA |
| 2009 | 1.61 | -92.61 % |
| 2010 | 19.98 | 1,142.46 % |
|
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