|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.48 | NA |
| 1987 | 4.91 | 9.59 % |
| 1988 | 5.09 | 3.64 % |
| 1989 | 5.71 | 12.17 % |
| 1990 | 7.11 | 24.65 % |
| 1991 | 6.35 | -10.70 % |
| 1992 | 8.85 | 39.29 % |
| 1993 | 8.30 | -6.26 % |
| 1994 | 8.36 | 0.82 % |
| 1995 | 7.89 | -5.64 % |
| 1996 | 7.10 | -10.08 % |
| 1997 | 10.41 | 46.66 % |
| 1998 | 11.29 | 8.45 % |
| 1999 | 11.80 | 4.53 % |
| 2000 | 11.28 | -4.42 % |
| 2001 | 11.98 | 6.25 % |
| 2002 | 11.43 | -4.61 % |
| 2003 | 11.46 | 0.23 % |
| 2004 | 13.08 | 14.21 % |
| 2005 | 12.67 | -3.15 % |
| 2006 | 12.65 | -0.16 % |
| 2007 | 12.75 | 0.81 % |
| 2008 | 12.53 | -1.76 % |
| 2009 | 12.67 | 1.14 % |
| 2010 | 13.20 | 4.19 % |
|
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