|
| year | consumption | change |
| 1980 | 11.00 | NA |
| 1981 | 12.00 | 9.09 % |
| 1982 | 11.00 | -8.33 % |
| 1983 | 14.00 | 27.27 % |
| 1984 | 12.00 | -14.29 % |
| 1985 | 10.84 | -9.67 % |
| 1986 | 9.83 | -9.33 % |
| 1987 | 10.40 | 5.81 % |
| 1988 | 11.75 | 12.98 % |
| 1989 | 15.62 | 32.97 % |
| 1990 | 15.32 | -1.96 % |
| 1991 | 15.51 | 1.24 % |
| 1992 | 16.09 | 3.76 % |
| 1993 | 15.08 | -6.28 % |
| 1994 | 15.25 | 1.15 % |
| 1995 | 14.10 | -7.54 % |
| 1996 | 15.04 | 6.60 % |
| 1997 | 16.09 | 7.01 % |
| 1998 | 15.29 | -4.98 % |
| 1999 | 13.19 | -13.73 % |
| 2000 | 12.14 | -7.93 % |
| 2001 | 12.53 | 3.16 % |
| 2002 | 11.94 | -4.72 % |
| 2003 | 12.58 | 5.44 % |
| 2004 | 12.72 | 1.11 % |
| 2005 | 12.67 | -0.44 % |
| 2006 | 13.89 | 9.66 % |
| 2007 | 15.46 | 11.31 % |
| 2008 | 19.64 | 26.99 % |
| 2009 | 14.30 | -27.17 % |
| 2010 | 16.54 | 15.63 % |
| 2011 | 14.00 | -15.34 % |
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