Year % 1999 4.094103 2000 3.692974 2001 4.024472 2002 1.084133 2003 1.036286 2004 1.030962 2005 0.246411 2006 0.3003311 2007 0.3055845 2008 0.2749484 2009 0.3570138 2010 1.091148 2011 0.8613235 2012 0.8613235 2013 0.0512457 2014 0.040288 2015 0.0305659 2016 0.0303306 2017 0.1486947 2018 0.095124 2019 0.0500254 2020 0.0051064 2021 0.0060911