|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.33 | NA |
| 1987 | 2.90 | 24.55 % |
| 1988 | | NA |
| 1989 | 2.37 | NA |
| 1990 | 1.83 | -22.85 % |
| 1991 | 2.54 | 38.87 % |
| 1992 | 2.26 | -11.07 % |
| 1993 | 1.91 | -15.66 % |
| 1994 | 2.77 | 45.56 % |
| 1995 | 2.80 | 0.76 % |
| 1996 | 4.26 | 52.33 % |
| 1997 | 2.24 | -47.28 % |
| 1998 | 2.22 | -0.94 % |
| 1999 | 2.96 | 33.33 % |
| 2000 | 1.73 | -41.59 % |
| 2001 | 2.08 | 19.84 % |
| 2002 | 2.33 | 12.25 % |
| 2003 | 2.46 | 5.45 % |
| 2004 | 3.38 | 37.55 % |
| 2005 | 3.32 | -1.61 % |
| 2006 | 2.41 | -27.39 % |
| 2007 | 4.00 | 65.79 % |
| 2008 | 6.46 | 61.38 % |
| 2009 | 1.31 | -79.67 % |
| 2010 | 1.50 | 14.52 % |
|
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