|
| year | consumption | change |
| 1980 | 44.90 | NA |
| 1981 | 42.00 | -6.46 % |
| 1982 | 41.00 | -2.38 % |
| 1983 | 43.00 | 4.88 % |
| 1984 | 40.90 | -4.88 % |
| 1985 | 47.80 | 16.87 % |
| 1986 | 46.27 | -3.19 % |
| 1987 | 47.66 | 3.00 % |
| 1988 | 43.30 | -9.16 % |
| 1989 | 34.83 | -19.57 % |
| 1990 | 33.00 | -5.24 % |
| 1991 | 53.36 | 61.70 % |
| 1992 | 55.08 | 3.21 % |
| 1993 | 67.45 | 22.46 % |
| 1994 | 76.47 | 13.37 % |
| 1995 | 82.42 | 7.78 % |
| 1996 | 85.32 | 3.52 % |
| 1997 | 97.26 | 13.99 % |
| 1998 | 99.70 | 2.52 % |
| 1999 | 103.99 | 4.30 % |
| 2000 | 105.53 | 1.48 % |
| 2001 | 101.32 | -3.99 % |
| 2002 | 101.92 | 0.59 % |
| 2003 | 104.49 | 2.53 % |
| 2004 | 102.29 | -2.11 % |
| 2005 | 97.45 | -4.73 % |
| 2006 | 86.75 | -10.99 % |
| 2007 | 79.11 | -8.80 % |
| 2008 | 102.65 | 29.76 % |
| 2009 | 128.86 | 25.53 % |
| 2010 | 120.37 | -6.59 % |
| 2011 | 88.00 | -26.89 % |
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