Year % 2001 0.6 2004 21.53846 2005 23.57143 2006 27.22513 2007 21.69811 2008 25.83333 2009 28.85572 2010 28 2011 34.17722 2012 17.6 2013 2.071563 2014 3.541913 2015 4.725415 2016 5.213005 2017 2.45098 2018 11.21823 2019 11.30285 2020 11.28271 2021 11.23018