|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 1.90 | NA |
| 1993 | 1.94 | 1.95 % |
| 1994 | 1.65 | -14.75 % |
| 1995 | 1.21 | -26.92 % |
| 1996 | .98 | -18.64 % |
| 1997 | 1.21 | 22.92 % |
| 1998 | 1.40 | 15.79 % |
| 1999 | 1.24 | -11.36 % |
| 2000 | 1.46 | 17.63 % |
| 2001 | 1.53 | 4.63 % |
| 2002 | 1.62 | 6.25 % |
| 2003 | 1.59 | -1.96 % |
| 2004 | 1.74 | 9.70 % |
| 2005 | 1.78 | 2.10 % |
| 2006 | 1.88 | 5.36 % |
| 2007 | 1.68 | -10.17 % |
| 2008 | 1.53 | -9.43 % |
| 2009 | 1.40 | -8.33 % |
| 2010 | 1.46 | 4.55 % |
|
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