Year % 1999 0 2001 0 2002 19.65786 2003 22.37443 2004 23.32155 2005 23.51813 2006 18.0667 2007 0.8528227 2008 1.159814 2009 0.7909778 2010 1.034552 2011 0.3890476 2012 0.6461843 2013 0.3690382 2015 0.0995843 2016 0.1425256 2020 0 2021 0.8633906