Year | Value | 2022 | 10.02458842309 | 2021 | 14.425555549557 | 2020 | 16.117952317123 | 2019 | 15.535388662318 | 2018 | 15.876147247426 | 2017 | 16.231456850047 | 2016 | 18.595309645341 | 2015 | 18.356144523096 | 2014 | 17.579053109732 | 2013 | 19.722371205061 | 2012 | 16.755056758343 | 2011 | 13.965616861156 | 2010 | 17.005610941448 | 2009 | 14.055167334403 | 2008 | 23.325148131337 | 2007 | 23.865671766049 | 2006 | 21.776608166466 | 2005 | 22.902932573303 | 2004 | 24.044357988886 | 2003 | 16.867637452478 | 2002 | 21.26664603049 | 2001 | 21.964985617166 | 2000 | 18.300032897287 | 1999 | 20.295652918455 | 1998 | 4.678229704017 | 1997 | 8.7125151747089 | 1996 | 13.465978212164 |
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