Year % 1999 0 2001 0 2002 4.16034 2003 3.756746 2004 2.451413 2005 4.161154 2006 0 2007 2.061424 2008 2.434565 2009 2.224944 2010 2.209723 2011 3.18625 2012 0.0634291 2013 2.891577 2015 0.8789401 2016 3.656798 2020 0.0424863 2021 1.149843