| Year | Value | | 2022 | 9.6214760848907 | | 2021 | 3.9256028310428 | | 2020 | 0.43808894032067 | | 2019 | -1.6582669484637 | | 2018 | 0.29954650738793 | | 2017 | 1.7598574292716 | | 2016 | -1.7996470708339 | | 2015 | 1.4506905760596 | | 2014 | 0.88381454713784 | | 2013 | 0.60673635635147 | | 2012 | 5.3231284706406 | | 2011 | 2.9556439522939 | | 2010 | 1.1089269067019 | | 2009 | 2.463751885723 | | 2008 | 9.1709881366768 | | 2007 | 1.4120020171458 | | 2006 | 1.5435259692758 | | 2005 | 6.3978829389788 | | 2004 | -3.0997812806396 | | 2003 | -1.3467261904762 | | 2002 | 5.032822757112 | | 2001 | 5.1870119194407 | | 2000 | 0.67766165904677 | | 1999 | -1.201903686375 | | 1998 | 4.0365894595499 | | 1997 | 0.3629997959467 | | 1996 | 6.8054599678824 | | 1995 | 13.441769681197 | | 1994 | 23.176791152428 | | 1993 | 0.2637678842618 | | 1992 | -6.2425059952042 | | 1991 | 1.8004272200185 | | 1990 | 0.60633970373752 | | 1989 | 0.076692997928865 |
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