|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.58 | NA |
| 1987 | 2.76 | 7.20 % |
| 1988 | 1.98 | -28.16 % |
| 1989 | .73 | -63.26 % |
| 1990 | 3.01 | 312.46 % |
| 1991 | 3.56 | 18.41 % |
| 1992 | 6.32 | 77.46 % |
| 1993 | 5.59 | -11.50 % |
| 1994 | 2.64 | -52.88 % |
| 1995 | 3.84 | 45.82 % |
| 1996 | 4.02 | 4.58 % |
| 1997 | 5.32 | 32.35 % |
| 1998 | 5.13 | -3.57 % |
| 1999 | 4.98 | -3.01 % |
| 2000 | 5.78 | 16.14 % |
| 2001 | 5.91 | 2.35 % |
| 2002 | 6.65 | 12.45 % |
| 2003 | 5.67 | -14.74 % |
| 2004 | 7.57 | 33.47 % |
| 2005 | 8.04 | 6.26 % |
| 2006 | 5.51 | -31.45 % |
| 2007 | 7.54 | 36.81 % |
| 2008 | 11.73 | 55.56 % |
| 2009 | 10.41 | -11.24 % |
| 2010 | 13.17 | 26.45 % |
|
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