| Year | Value | | 2021 | 35.665407880061 | | 2020 | -18.374303925937 | | 2019 | -12.086340658824 | | 2018 | 13.169698676441 | | 2017 | -30.455383809895 | | 2016 | -20.10219275796 | | 2015 | -15.823993757004 | | 2014 | 12.932483369316 | | 2013 | 26.612528522378 | | 2012 | 66.20356586084 | | 2011 | -26.205911786648 | | 2010 | 38.230658902766 | | 2009 | 25.914488506502 | | 2008 | 22.052389349906 | | 2007 | 9.4926329545258 | | 2006 | 29.115838811173 | | 2005 | 41.536174590624 | | 2004 | -28.319133287431 | | 2003 | 96.595139568304 | | 2002 | 40.649932762762 | | 2001 | 1,491.6208751273 | | 2000 | -95.415879050778 | | 1999 | -19.333999945696 | | 1998 | 66.013393209161 | | 1997 | 241.39983427884 | | 1996 | 34.379954844246 | | 1995 | -91.041409353715 | | 1994 | 16.79070860361 | | 1993 | -28.032230789844 | | 1992 | 6.6592018635602 | | 1991 | 55.431517268279 | | 1990 | 4.6715298026045 | | 1989 | -23.81627950946 | | 1988 | -32.795856984228 | | 1987 | -14.051620874407 | | 1986 | -21.214057624034 | | 1985 | -17.959115826242 | | 1984 | 0.63739940315422 | | 1983 | -13.63306989301 | | 1982 | 52.546798070388 | | 1981 | 60.487193461712 | | 1980 | 46.992773125214 | | 1979 | 0.51906969631925 | | 1978 | -11.380905546149 | | 1977 | -12.717555092899 | | 1976 | -16.330465507572 | | 1975 | 5.9125520570256 | | 1974 | -3.9223914995492 | | 1973 | 13.362095739139 | | 1972 | 4.5906156161132 | | 1971 | 11.181271593126 |
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