| Year | Value | | 2022 | 17.310283019881 | | 2021 | 3.2758293743116 | | 2020 | 0.21906490484216 | | 2019 | 2.8114092007562 | | 2018 | 2.534454241866 | | 2017 | 2.9303631237467 | | 2016 | 0.14063333450533 | | 2015 | 0.17424224362519 | | 2014 | 0.62049063673242 | | 2013 | 0.029454778257922 | | 2012 | 2.2577892437459 | | 2011 | 4.3707355993922 | | 2010 | -1.0846359501516 | | 2009 | 3.5341067285894 | | 2008 | 15.402319106499 | | 2007 | 10.092977584917 | | 2006 | 6.5361990876588 | | 2005 | 6.7484502789311 | | 2004 | 6.1923854719744 | | 2003 | 2.9426475294847 | | 2002 | 1.938875738559 | | 2001 | 2.4870400355546 | | 2000 | 2.6542547779605 | | 1999 | 2.3648183611181 | | 1998 | 4.6442142266079 | | 1997 | 8.4473834209295 | | 1996 | 17.610469843103 | | 1995 | 24.975935531675 | | 1994 | 35.924705392964 | | 1993 | 108.98954062432 | | 1992 | 951.6961948708 |
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