|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 1.30 | NA |
| 1993 | 1.23 | -5.01 % |
| 1994 | .48 | -60.97 % |
| 1995 | .58 | 19.45 % |
| 1996 | .62 | 8.35 % |
| 1997 | .51 | -18.49 % |
| 1998 | .83 | 62.50 % |
| 1999 | 1.02 | 23.08 % |
| 2000 | .92 | -9.62 % |
| 2001 | .67 | -27.39 % |
| 2002 | 1.03 | 54.71 % |
| 2003 | 1.18 | 13.89 % |
| 2004 | 1.30 | 10.51 % |
| 2005 | 1.49 | 14.95 % |
| 2006 | 1.72 | 14.89 % |
| 2007 | 2.03 | 18.52 % |
| 2008 | 2.10 | 3.12 % |
| 2009 | 2.03 | -3.03 % |
| 2010 | 2.00 | -1.56 % |
|
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