Year Number 2005 -0.132531121373177 2006 -0.549078822135925 2007 -0.127576693892479 2008 -0.0704953894019127 2009 0.029315197840333 2010 -0.00725272670388222 2011 0.000100756362371612 2012 0.0344146750867367 2013 0.0935674980282784 2014 0.175064265727997 2015 0.226326778531075 2016 0.234211266040802 2017 0.323513835668564 2018 0.391958713531494 2019 0.394997239112854 2020 0.424208730459213 2021 0.420747458934784 2022 0.543230414390564