|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.54 | NA |
| 1987 | 1.24 | -19.59 % |
| 1988 | 1.61 | 30.13 % |
| 1989 | 1.76 | 9.43 % |
| 1990 | 1.64 | -6.67 % |
| 1991 | 1.74 | 5.69 % |
| 1992 | 1.84 | 5.64 % |
| 1993 | 1.43 | -22.12 % |
| 1994 | 1.38 | -3.56 % |
| 1995 | 1.92 | 39.23 % |
| 1996 | 1.14 | -40.73 % |
| 1997 | 1.84 | 61.65 % |
| 1998 | 1.89 | 2.78 % |
| 1999 | 3.35 | 77.29 % |
| 2000 | 2.01 | -40.11 % |
| 2001 | 2.91 | 45.08 % |
| 2002 | 2.11 | -27.68 % |
| 2003 | 1.82 | -13.39 % |
| 2004 | 1.90 | 3.97 % |
| 2005 | 2.05 | 8.28 % |
| 2006 | 5.27 | 156.61 % |
| 2007 | 6.32 | 20.05 % |
| 2008 | 1.94 | -69.35 % |
| 2009 | 1.99 | 2.68 % |
| 2010 | 1.83 | -8.03 % |
|
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