|
| year | consumption | change |
| 1984 | 5.82 | NA |
| 1985 | 4.88 | -16.07 % |
| 1986 | 4.51 | -7.58 % |
| 1987 | 3.78 | -16.15 % |
| 1988 | 3.27 | -13.56 % |
| 1989 | 3.55 | 8.57 % |
| 1990 | 3.29 | -7.41 % |
| 1991 | 3.01 | -8.33 % |
| 1992 | 3.65 | 21.03 % |
| 1993 | 3.28 | -10.17 % |
| 1994 | 2.48 | -24.33 % |
| 1995 | 2.45 | -1.33 % |
| 1996 | 2.37 | -3.18 % |
| 1997 | 2.52 | 6.40 % |
| 1998 | 2.04 | -19.24 % |
| 1999 | 1.53 | -24.63 % |
| 2000 | 1.90 | 24.12 % |
| 2001 | 1.52 | -20.44 % |
| 2002 | 2.04 | 34.36 % |
| 2003 | 1.82 | -10.77 % |
| 2004 | 1.14 | -36.98 % |
| 2005 | .48 | -58.36 % |
| 2006 | .38 | -20.11 % |
| 2007 | .61 | 59.71 % |
| 2008 | .51 | -16.00 % |
| 2009 | .71 | 38.88 % |
| 2010 | .38 | -46.33 % |
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