|
| year | consumption | change |
| 1984 | .70 | NA |
| 1985 | 1.08 | 53.73 % |
| 1986 | .92 | -14.47 % |
| 1987 | 1.19 | 29.38 % |
| 1988 | .57 | -51.97 % |
| 1989 | .76 | 31.79 % |
| 1990 | .68 | -10.51 % |
| 1991 | .65 | -4.45 % |
| 1992 | .57 | -11.26 % |
| 1993 | .45 | -21.69 % |
| 1994 | .32 | -29.27 % |
| 1995 | .23 | -27.59 % |
| 1996 | .19 | -19.27 % |
| 1997 | .23 | 23.87 % |
| 1998 | .62 | 170.24 % |
| 1999 | 1.22 | 95.59 % |
| 2000 | 2.41 | 98.33 % |
| 2001 | 2.12 | -12.22 % |
| 2002 | 2.29 | 8.02 % |
| 2003 | 2.67 | 16.89 % |
| 2004 | 2.82 | 5.45 % |
| 2005 | 3.24 | 14.85 % |
| 2006 | 3.95 | 22.00 % |
| 2007 | 3.57 | -9.71 % |
| 2008 | 3.83 | 7.46 % |
| 2009 | 5.01 | 30.65 % |
| 2010 | 5.36 | 6.95 % |
|
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