Year % 2001 4.5551499439097745 2002 3.716770285314629 2003 4.2361125969845395 2004 7.429714161318618 2005 18.038346663147724 2006 16.2712766930966 2007 12.26425678287639 2008 13.882310614164508 2009 17.5799497655156 2010 12.760666581397833 2011 6.369791257565294 2012 11.2827997982187 2013 11.786220437075725 2014 14.566896305343068 2015 11.335620165546336 2016 18.420278799793575 2017 26.909972493549922 2018 19.17343169338096 2019 21.83139547175875 2020 18.664986665697565 2021 11.560228535184452 2022 15.975289500637308 2023 13.563285150890442