Year % 1996 18.81133 1999 19.85834 2000 20.17588 2001 0 2002 0 2003 0 2005 0 2006 0 2007 0 2010 2.856025 2011 2.385407 2012 0.2620545 2013 0.4087889 2014 0.081616 2015 0.0653452 2016 0.0593354 2019 0 2020 0