|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | 41.50 % |
| 1982 | .00 | -9.13 % |
| 1983 | .00 | 10.58 % |
| 1984 | .00 | 0.48 % |
| 1985 | .00 | -12.86 % |
| 1986 | .00 | 0.55 % |
| 1987 | .00 | 15.22 % |
| 1988 | .00 | 9.91 % |
| 1989 | .00 | 3.86 % |
| 1990 | .00 | 2.07 % |
| 1991 | .00 | 0.00 % |
| 1992 | .00 | -2.02 % |
| 1993 | .00 | -7.85 % |
| 1994 | .00 | 4.93 % |
| 1995 | .00 | 3.42 % |
| 1996 | .00 | 0.00 % |
| 1997 | .00 | 0.00 % |
| 1998 | .00 | 0.00 % |
| 1999 | .00 | 0.00 % |
| 2000 | .00 | 3.31 % |
| 2001 | .00 | 0.40 % |
| 2002 | .00 | 3.59 % |
| 2003 | .00 | 0.00 % |
| 2004 | .00 | 2.69 % |
| 2005 | .00 | 10.11 % |
| 2006 | .00 | -7.14 % |
| 2007 | .00 | 10.99 % |
| 2008 | .00 | -2.97 % |
| 2009 | .00 | -7.14 % |
| 2010 | .00 | 9.89 % |
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