Year % 2002 13.630510233515917 2003 15.36358167492223 2004 14.992751920699915 2005 12.660931271377477 2006 13.111999031186603 2007 13.958631472251573 2008 13.302637964382175 2009 22.597896454346923 2010 21.810937427218658 2011 21.747654689031954 2012 18.71322249711055 2013 17.65634499383951 2014 17.94078441970128 2015 19.590320954153494 2016 18.940802401153405 2017 19.56550129406137 2018 17.989829705315604 2019 18.12614090233907 2020 21.69203199776586 2021 25.366590166645576 2022 20.758724309761437 2023 21.35909949690106