Year % 2001 18.646981192649932 2002 10.541359330037878 2003 15.123911797154655 2004 20.08498458992429 2005 23.235793702223976 2006 27.133174946630728 2007 26.478476055238094 2008 19.689219099794787 2009 21.556173494517633 2010 21.76735699586691 2011 19.897963982133287 2012 19.036211959218804 2013 21.041597644551196 2014 22.130701246579797 2015 23.981669192324702 2016 25.316338395222875 2017 27.399999932839258 2018 27.527552496991557 2019 26.820734106989207 2020 29.296030754898673 2021 34.087512026321306 2022 32.06238827223722 2023 28.077196488702473