|
| year | consumption | change |
| 1980 | 6.70 | NA |
| 1981 | | NA |
| 1982 | 7.10 | NA |
| 1983 | 7.50 | 5.63 % |
| 1984 | 7.20 | -4.00 % |
| 1985 | 7.95 | 10.43 % |
| 1986 | 8.42 | 5.94 % |
| 1987 | 7.99 | -5.10 % |
| 1988 | 7.24 | -9.41 % |
| 1989 | 7.85 | 8.42 % |
| 1990 | 8.16 | 3.98 % |
| 1991 | 8.34 | 2.15 % |
| 1992 | 8.44 | 1.23 % |
| 1993 | 8.40 | -0.53 % |
| 1994 | 8.14 | -3.09 % |
| 1995 | 8.21 | 0.95 % |
| 1996 | 7.92 | -3.63 % |
| 1997 | 9.19 | 16.05 % |
| 1998 | 9.49 | 3.29 % |
| 1999 | 9.74 | 2.63 % |
| 2000 | 10.82 | 11.11 % |
| 2001 | 10.37 | -4.16 % |
| 2002 | 10.37 | 0.00 % |
| 2003 | 10.57 | 1.93 % |
| 2004 | 7.10 | -32.80 % |
| 2005 | 9.83 | 38.40 % |
| 2006 | 9.30 | -5.42 % |
| 2007 | 8.30 | -10.71 % |
| 2008 | 7.72 | -7.03 % |
| 2009 | 9.30 | 20.50 % |
| 2010 | 8.78 | -5.64 % |
| 2011 | | NA |
|
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