Year Percent 2003-01-01 0.015882 2004-01-01 0.002928 2005-01-01 0.001101 2006-01-01 0.001101 2007-01-01 0.001101 2008-01-01 2.598750 2009-01-01 4.732170 2010-01-01 7.019690 2011-01-01 6.848720 2012-01-01 12.405100 2013-01-01 11.351300 2014-01-01 11.165000 2015-01-01 12.452100 2016-01-01 13.618300