|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | 3.20 | NA |
| 1988 | 3.30 | 3.12 % |
| 1989 | | NA |
| 1990 | 3.80 | NA |
| 1991 | 3.85 | 1.43 % |
| 1992 | 4.06 | 5.21 % |
| 1993 | 4.02 | -0.77 % |
| 1994 | 4.66 | 15.79 % |
| 1995 | 4.24 | -9.09 % |
| 1996 | 17.10 | 303.72 % |
| 1997 | 7.80 | -54.39 % |
| 1998 | 4.32 | -44.61 % |
| 1999 | 4.43 | 2.45 % |
| 2000 | 4.69 | 5.93 % |
| 2001 | 4.66 | -0.63 % |
| 2002 | 4.64 | -0.45 % |
| 2003 | 4.83 | 4.11 % |
| 2004 | 6.23 | 29.03 % |
| 2005 | 6.33 | 1.63 % |
| 2006 | 5.21 | -17.73 % |
| 2007 | 5.49 | 5.28 % |
| 2008 | 5.63 | 2.70 % |
| 2009 | 6.97 | 23.68 % |
| 2010 | 7.69 | 10.33 % |
|
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