|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.07 | NA |
| 1987 | 5.29 | 4.36 % |
| 1988 | 5.71 | 7.90 % |
| 1989 | 5.22 | -8.62 % |
| 1990 | 4.75 | -8.93 % |
| 1991 | 4.07 | -14.33 % |
| 1992 | 4.33 | 6.48 % |
| 1993 | 4.44 | 2.43 % |
| 1994 | 4.50 | 1.27 % |
| 1995 | 4.53 | 0.83 % |
| 1996 | 4.59 | 1.27 % |
| 1997 | 4.70 | 2.31 % |
| 1998 | 4.74 | 1.00 % |
| 1999 | 5.89 | 24.14 % |
| 2000 | 6.41 | 8.83 % |
| 2001 | 8.18 | 27.62 % |
| 2002 | 9.11 | 11.43 % |
| 2003 | 10.17 | 11.54 % |
| 2004 | 11.30 | 11.19 % |
| 2005 | 12.76 | 12.89 % |
| 2006 | 15.82 | 23.99 % |
| 2007 | 14.98 | -5.32 % |
| 2008 | 14.89 | -0.62 % |
| 2009 | 16.59 | 11.46 % |
| 2010 | 26.31 | 58.59 % |
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