|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | 6.50 | NA |
| 1994 | 5.03 | -22.57 % |
| 1995 | 4.87 | -3.15 % |
| 1996 | 4.97 | 1.97 % |
| 1997 | 4.14 | -16.62 % |
| 1998 | 3.21 | -22.47 % |
| 1999 | 3.12 | -2.84 % |
| 2000 | 2.31 | -25.93 % |
| 2001 | 2.08 | -9.99 % |
| 2002 | 1.50 | -28.01 % |
| 2003 | 1.11 | -25.67 % |
| 2004 | 1.00 | -10.08 % |
| 2005 | 1.13 | 13.04 % |
| 2006 | 1.50 | 32.26 % |
| 2007 | 1.24 | -17.07 % |
| 2008 | 1.53 | 23.53 % |
| 2009 | .97 | -36.90 % |
| 2010 | .51 | -47.17 % |
|
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