|
| year | consumption | change |
| 1980 | 14.20 | NA |
| 1981 | 12.20 | -14.08 % |
| 1982 | 11.00 | -9.84 % |
| 1983 | | NA |
| 1984 | 6.70 | NA |
| 1985 | 8.58 | 27.99 % |
| 1986 | 8.51 | -0.79 % |
| 1987 | 7.16 | -15.85 % |
| 1988 | 7.93 | 10.77 % |
| 1989 | 8.70 | 9.72 % |
| 1990 | 10.54 | 21.17 % |
| 1991 | 9.73 | -7.73 % |
| 1992 | 9.20 | -5.40 % |
| 1993 | 9.62 | 4.50 % |
| 1994 | 9.42 | -2.00 % |
| 1995 | 9.73 | 3.25 % |
| 1996 | 9.54 | -1.95 % |
| 1997 | 9.82 | 2.92 % |
| 1998 | 9.92 | 1.01 % |
| 1999 | 9.92 | 0.00 % |
| 2000 | 10.33 | 4.13 % |
| 2001 | 10.88 | 5.38 % |
| 2002 | 11.46 | 5.26 % |
| 2003 | 11.73 | 2.36 % |
| 2004 | 12.22 | 4.17 % |
| 2005 | 12.58 | 2.97 % |
| 2006 | 12.94 | 2.88 % |
| 2007 | 12.78 | -1.25 % |
| 2008 | 12.78 | 0.00 % |
| 2009 | 13.14 | 2.79 % |
| 2010 | 12.90 | -1.78 % |
| 2011 | 15.00 | 16.27 % |
|
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