|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 6.80 | NA |
| 1987 | 3.95 | -41.90 % |
| 1988 | 1.98 | -49.81 % |
| 1989 | 1.84 | -7.09 % |
| 1990 | 1.96 | 6.14 % |
| 1991 | 1.80 | -7.97 % |
| 1992 | 1.78 | -1.20 % |
| 1993 | 2.06 | 15.64 % |
| 1994 | | NA |
| 1995 | 4.18 | NA |
| 1996 | 4.17 | -0.27 % |
| 1997 | 1.99 | -52.38 % |
| 1998 | 1.89 | -4.71 % |
| 1999 | 1.85 | -2.47 % |
| 2000 | 2.28 | 23.71 % |
| 2001 | 1.89 | -17.12 % |
| 2002 | 2.90 | 53.09 % |
| 2003 | 2.45 | -15.32 % |
| 2004 | 2.47 | 0.68 % |
| 2005 | 2.24 | -9.19 % |
| 2006 | 2.48 | 10.42 % |
| 2007 | 2.22 | -10.38 % |
| 2008 | .93 | -57.90 % |
| 2009 | 2.76 | 195.00 % |
| 2010 | 2.66 | -3.39 % |
|
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