|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.69 | NA |
| 1987 | 2.66 | -1.07 % |
| 1988 | 2.53 | -5.06 % |
| 1989 | 2.76 | 9.48 % |
| 1990 | 2.86 | 3.28 % |
| 1991 | 2.92 | 2.16 % |
| 1992 | 3.37 | 15.61 % |
| 1993 | 3.48 | 3.19 % |
| 1994 | 2.68 | -23.14 % |
| 1995 | 2.79 | 4.36 % |
| 1996 | .48 | -82.81 % |
| 1997 | 2.22 | 361.92 % |
| 1998 | 2.67 | 20.31 % |
| 1999 | 2.67 | 0.00 % |
| 2000 | 2.71 | 1.71 % |
| 2001 | 3.14 | 15.64 % |
| 2002 | 3.14 | 0.00 % |
| 2003 | 3.14 | 0.00 % |
| 2004 | 2.97 | -5.41 % |
| 2005 | 2.97 | 0.26 % |
| 2006 | 3.28 | 10.43 % |
| 2007 | 3.10 | -5.56 % |
| 2008 | 3.29 | 6.18 % |
| 2009 | 4.29 | 30.20 % |
| 2010 | 3.75 | -12.55 % |
|
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