|
| year | consumption | change |
| 1984 | 4.37 | NA |
| 1985 | 2.36 | -46.01 % |
| 1986 | .52 | -78.19 % |
| 1987 | 5.34 | 936.17 % |
| 1988 | 5.73 | 7.46 % |
| 1989 | 5.12 | -10.81 % |
| 1990 | 5.15 | 0.64 % |
| 1991 | 5.84 | 13.52 % |
| 1992 | 5.10 | -12.66 % |
| 1993 | 5.68 | 11.39 % |
| 1994 | 5.50 | -3.33 % |
| 1995 | 5.15 | -6.28 % |
| 1996 | 5.83 | 13.20 % |
| 1997 | 6.55 | 12.35 % |
| 1998 | 7.03 | 7.28 % |
| 1999 | 6.48 | -7.76 % |
| 2000 | 6.28 | -3.14 % |
| 2001 | 6.16 | -1.82 % |
| 2002 | 6.83 | 10.84 % |
| 2003 | 6.26 | -8.34 % |
| 2004 | 6.84 | 9.28 % |
| 2005 | 6.36 | -7.13 % |
| 2006 | 6.80 | 7.03 % |
| 2007 | 5.91 | -13.13 % |
| 2008 | 6.56 | 11.01 % |
| 2009 | 5.97 | -8.96 % |
| 2010 | 6.10 | 2.16 % |
|
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