|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.94 | NA |
| 1987 | 2.82 | -4.07 % |
| 1988 | 3.00 | 6.27 % |
| 1989 | 3.23 | 7.61 % |
| 1990 | 3.11 | -3.57 % |
| 1991 | 5.68 | 82.64 % |
| 1992 | 3.23 | -43.22 % |
| 1993 | 3.09 | -4.13 % |
| 1994 | 3.11 | 0.68 % |
| 1995 | 3.62 | 16.33 % |
| 1996 | 3.60 | -0.59 % |
| 1997 | 3.62 | 0.60 % |
| 1998 | 3.83 | 5.79 % |
| 1999 | 4.15 | 8.35 % |
| 2000 | 4.14 | -0.27 % |
| 2001 | 4.26 | 2.83 % |
| 2002 | 4.26 | 0.00 % |
| 2003 | 3.47 | -18.41 % |
| 2004 | 3.55 | 2.16 % |
| 2005 | 5.59 | 57.57 % |
| 2006 | 3.11 | -44.32 % |
| 2007 | 2.63 | -15.65 % |
| 2008 | 2.16 | -17.74 % |
| 2009 | 1.78 | -17.65 % |
| 2010 | .97 | -45.24 % |
|
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