|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.04 | NA |
| 1987 | 1.43 | -30.00 % |
| 1988 | 1.43 | -0.27 % |
| 1989 | 1.02 | -28.38 % |
| 1990 | .92 | -10.00 % |
| 1991 | .86 | -5.96 % |
| 1992 | 2.24 | 159.21 % |
| 1993 | 1.94 | -13.40 % |
| 1994 | 1.98 | 2.11 % |
| 1995 | 2.43 | 22.44 % |
| 1996 | 2.48 | 2.17 % |
| 1997 | 2.64 | 6.61 % |
| 1998 | 4.27 | 61.65 % |
| 1999 | 5.27 | 23.40 % |
| 2000 | 5.33 | 1.07 % |
| 2001 | 5.38 | 0.95 % |
| 2002 | 5.50 | 2.18 % |
| 2003 | 5.38 | -2.23 % |
| 2004 | 5.20 | -3.31 % |
| 2005 | 5.50 | 5.78 % |
| 2006 | 5.41 | -1.67 % |
| 2007 | 5.40 | -0.19 % |
| 2008 | 5.46 | 1.27 % |
| 2009 | 4.69 | -14.19 % |
| 2010 | 4.75 | 1.23 % |
|
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