|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.86 | NA |
| 1987 | 5.91 | 0.88 % |
| 1988 | 6.43 | 8.80 % |
| 1989 | 8.38 | 30.17 % |
| 1990 | 7.60 | -9.25 % |
| 1991 | 8.21 | 8.00 % |
| 1992 | 8.65 | 5.44 % |
| 1993 | 9.14 | 5.60 % |
| 1994 | 9.87 | 8.01 % |
| 1995 | 10.22 | 3.56 % |
| 1996 | 10.26 | 0.32 % |
| 1997 | 11.28 | 9.98 % |
| 1998 | 11.22 | -0.52 % |
| 1999 | 8.60 | -23.35 % |
| 2000 | 12.10 | 40.66 % |
| 2001 | 12.73 | 5.26 % |
| 2002 | 11.27 | -11.51 % |
| 2003 | 11.84 | 5.08 % |
| 2004 | 12.31 | 3.99 % |
| 2005 | 12.45 | 1.07 % |
| 2006 | 14.57 | 17.08 % |
| 2007 | 14.71 | 0.98 % |
| 2008 | 14.81 | 0.65 % |
| 2009 | 15.37 | 3.75 % |
| 2010 | 16.35 | 6.41 % |
|
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