| Year | Value | | 2022 | 15.209675274081 | | 2021 | 9.460283896231 | | 2020 | 5.5481435745651 | | 2019 | 5.5981559503985 | | 2018 | 4.8723022055069 | | 2017 | 6.0318372517778 | | 2016 | 11.83658076535 | | 2015 | 13.534489764974 | | 2014 | 18.119554352674 | | 2013 | 18.312261037787 | | 2012 | 59.219736023252 | | 2011 | 53.228698311817 | | 2010 | 7.7357480431251 | | 2009 | 12.94565634104 | | 2008 | 14.837876482825 | | 2007 | 8.4267527350531 | | 2006 | 6.9971290353559 | | 2005 | 10.338879445793 | | 2004 | 18.108242493765 | | 2003 | 28.397839913347 | | 2002 | 42.537548134879 | | 2001 | 61.134933161848 | | 2000 | 168.62023585093 | | 1999 | 293.67875088977 | | 1998 | 72.869717053535 | | 1997 | 63.937366335748 | | 1996 | 52.712076753195 | | 1995 | 709.34603211861 | | 1994 | 2,221.0165699204 | | 1993 | 1,190.2292334919 |
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