Year % 2003 0.6625869 2004 0.6789263 2006 0.7462406 2007 0.9188834 2008 0.7075564 2009 0.8477005 2010 0.6142358 2011 1.009367 2012 1.150346 2013 1.032465 2015 6.645153 2017 0.5942081 2018 0.4548799 2019 0.3601716 2020 0.3968254 2021 0.3874791