|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | 6.21 % |
| 1982 | .00 | 11.04 % |
| 1983 | .00 | 0.00 % |
| 1984 | .00 | 29.82 % |
| 1985 | .00 | -18.47 % |
| 1986 | .00 | 1.66 % |
| 1987 | .00 | -1.09 % |
| 1988 | .00 | 0.00 % |
| 1989 | .00 | 6.04 % |
| 1990 | .00 | 4.66 % |
| 1991 | .00 | 0.00 % |
| 1992 | .00 | 4.46 % |
| 1993 | .00 | 0.00 % |
| 1994 | .00 | -4.27 % |
| 1995 | .00 | 7.43 % |
| 1996 | .00 | 1.38 % |
| 1997 | .00 | 1.82 % |
| 1998 | .00 | 2.23 % |
| 1999 | .00 | 2.18 % |
| 2000 | .00 | 0.00 % |
| 2001 | .00 | 5.98 % |
| 2002 | .00 | 8.87 % |
| 2003 | .00 | -2.59 % |
| 2004 | .00 | 0.76 % |
| 2005 | .00 | 5.28 % |
| 2006 | .00 | -1.43 % |
| 2007 | .00 | 2.18 % |
| 2008 | .00 | 0.36 % |
| 2009 | .00 | 1.42 % |
| 2010 | .00 | 0.35 % |
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