|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.91 | NA |
| 1987 | 2.03 | 6.61 % |
| 1988 | 1.99 | -2.19 % |
| 1989 | 2.36 | 18.83 % |
| 1990 | 2.48 | 5.11 % |
| 1991 | 2.65 | 6.90 % |
| 1992 | 2.91 | 9.78 % |
| 1993 | 2.93 | 0.62 % |
| 1994 | 2.93 | 0.00 % |
| 1995 | 2.93 | 0.00 % |
| 1996 | 2.93 | 0.00 % |
| 1997 | 3.36 | 14.80 % |
| 1998 | 3.35 | -0.35 % |
| 1999 | 3.35 | 0.00 % |
| 2000 | 4.87 | 45.33 % |
| 2001 | 4.10 | -15.90 % |
| 2002 | 4.10 | 0.00 % |
| 2003 | 4.33 | 5.76 % |
| 2004 | 5.36 | 23.72 % |
| 2005 | 5.74 | 7.14 % |
| 2006 | 5.97 | 3.91 % |
| 2007 | 6.15 | 3.08 % |
| 2008 | 8.52 | 38.54 % |
| 2009 | 8.22 | -3.60 % |
| 2010 | 8.67 | 5.47 % |
|
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