|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .01 | 82.20 % |
| 1982 | .01 | 0.16 % |
| 1983 | .01 | 12.85 % |
| 1984 | .01 | 50.48 % |
| 1985 | .01 | 2.83 % |
| 1986 | .01 | -2.66 % |
| 1987 | .01 | 2.91 % |
| 1988 | .01 | 0.18 % |
| 1989 | .01 | 3.71 % |
| 1990 | .01 | 2.13 % |
| 1991 | .01 | 1.25 % |
| 1992 | .01 | 2.55 % |
| 1993 | .01 | -29.88 % |
| 1994 | .01 | 31.84 % |
| 1995 | .01 | 1.56 % |
| 1996 | .01 | -1.54 % |
| 1997 | .01 | 3.04 % |
| 1998 | .01 | 2.95 % |
| 1999 | .01 | -3.03 % |
| 2000 | .01 | 4.22 % |
| 2001 | .01 | -0.08 % |
| 2002 | .01 | 1.22 % |
| 2003 | .01 | 2.40 % |
| 2004 | .01 | -5.79 % |
| 2005 | .01 | 3.65 % |
| 2006 | .01 | -0.88 % |
| 2007 | .01 | -10.43 % |
| 2008 | .01 | 1.99 % |
| 2009 | .01 | 7.35 % |
| 2010 | .01 | 0.49 % |
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