Year % 1989 2.327448 1994 0 1998 0 1999 0 2000 0 2001 0 2002 0 2003 0 2004 0 2005 0.0653275 2006 0.0824266 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2015 0.0552384 2016 0.0113148 2019 0.0532104 2020 0.0454683 2021 0.044287