|
| year | consumption | change |
| 1980 | 109.00 | NA |
| 1981 | 100.00 | -8.26 % |
| 1982 | 95.00 | -5.00 % |
| 1983 | 89.00 | -6.32 % |
| 1984 | 85.00 | -4.49 % |
| 1985 | 70.70 | -16.82 % |
| 1986 | 69.20 | -2.12 % |
| 1987 | 69.62 | 0.61 % |
| 1988 | 64.82 | -6.90 % |
| 1989 | 68.67 | 5.93 % |
| 1990 | 67.00 | -2.42 % |
| 1991 | 63.52 | -5.19 % |
| 1992 | 62.73 | -1.24 % |
| 1993 | 63.06 | 0.53 % |
| 1994 | 65.91 | 4.51 % |
| 1995 | 69.47 | 5.41 % |
| 1996 | 69.29 | -0.25 % |
| 1997 | 73.73 | 6.39 % |
| 1998 | 73.66 | -0.09 % |
| 1999 | 71.18 | -3.36 % |
| 2000 | 70.96 | -0.31 % |
| 2001 | 71.86 | 1.26 % |
| 2002 | 70.51 | -1.88 % |
| 2003 | 65.76 | -6.74 % |
| 2004 | 66.39 | 0.97 % |
| 2005 | 69.94 | 5.34 % |
| 2006 | 73.14 | 4.57 % |
| 2007 | 75.63 | 3.40 % |
| 2008 | 87.09 | 15.15 % |
| 2009 | 79.04 | -9.24 % |
| 2010 | 74.80 | -5.37 % |
| 2011 | 70.00 | -6.41 % |
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