|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.14 | NA |
| 1987 | 7.45 | 45.00 % |
| 1988 | 9.56 | 28.18 % |
| 1989 | 8.50 | -11.01 % |
| 1990 | 5.76 | -32.27 % |
| 1991 | 3.65 | -36.69 % |
| 1992 | 3.09 | -15.37 % |
| 1993 | 3.59 | 16.36 % |
| 1994 | 3.23 | -9.97 % |
| 1995 | 3.30 | 2.01 % |
| 1996 | 3.64 | 10.26 % |
| 1997 | 3.82 | 5.13 % |
| 1998 | 3.80 | -0.69 % |
| 1999 | 3.90 | 2.82 % |
| 2000 | 3.92 | 0.32 % |
| 2001 | 2.83 | -27.78 % |
| 2002 | 3.76 | 33.06 % |
| 2003 | 1.78 | -52.80 % |
| 2004 | 2.59 | 45.65 % |
| 2005 | 4.21 | 62.61 % |
| 2006 | 3.25 | -22.78 % |
| 2007 | 2.50 | -23.02 % |
| 2008 | 3.06 | 22.43 % |
| 2009 | 2.85 | -6.87 % |
| 2010 | 2.50 | -12.29 % |
|
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