|
| year | consumption | change |
| 1980 | 46.00 | NA |
| 1981 | 44.00 | -4.35 % |
| 1982 | 43.00 | -2.27 % |
| 1983 | 43.60 | 1.40 % |
| 1984 | 43.00 | -1.38 % |
| 1985 | 41.53 | -3.42 % |
| 1986 | 38.00 | -8.50 % |
| 1987 | 33.77 | -11.13 % |
| 1988 | 31.93 | -5.46 % |
| 1989 | 27.02 | -15.37 % |
| 1990 | 20.00 | -25.98 % |
| 1991 | 17.86 | -10.68 % |
| 1992 | 20.54 | 15.00 % |
| 1993 | 16.73 | -18.57 % |
| 1994 | 13.29 | -20.53 % |
| 1995 | 14.83 | 11.56 % |
| 1996 | 11.68 | -21.27 % |
| 1997 | 12.47 | 6.83 % |
| 1998 | 15.03 | 20.48 % |
| 1999 | 18.04 | 20.03 % |
| 2000 | 21.04 | 16.62 % |
| 2001 | 22.68 | 7.82 % |
| 2002 | 24.28 | 7.03 % |
| 2003 | 27.40 | 12.87 % |
| 2004 | 28.83 | 5.21 % |
| 2005 | 31.20 | 8.24 % |
| 2006 | 31.89 | 2.20 % |
| 2007 | 31.54 | -1.08 % |
| 2008 | 29.99 | -4.92 % |
| 2009 | 27.56 | -8.12 % |
| 2010 | 25.87 | -6.12 % |
| 2011 | 44.00 | 70.09 % |
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