Year % 2001 3.990787492975771 2002 4.643743884713055 2003 8.248476578156346 2004 5.50783572907594 2005 8.710918037861298 2006 8.03472280847582 2007 21.70825153632695 2008 16.027110221903303 2009 18.905605106688295 2010 18.387613690873245 2011 15.530430168048234 2012 14.108442603650506 2013 15.08394839046368 2014 16.18111473227707 2015 17.890612891354614 2016 11.092139615875967 2017 9.36656984417185 2018 10.291582437064504 2019 8.05169050520499 2020 6.374357956254223 2021 8.304015364094717 2022 6.03211959703528 2023 5.906312247677541