Year Percent 1999-01-01 0.0048770000000000000 2000-01-01 0.1616770000000000000 2001-01-01 0.1699390000000000000 2002-01-01 0.1881230000000000000 2003-01-01 0.1563870000000000000 2004-01-01 0.1256200000000000000 2005-01-01 0.0670570000000000000 2006-01-01 0.0035680000000000000 2007-01-01 0.0055969999999999995 2008-01-01 0.0035560000000000000 2009-01-01 0.0258670000000000000 2010-01-01 0.0195860000000000030 2011-01-01 0.0141610000000000020 2012-01-01 0.0221920000000000000 2013-01-01 0.0296920000000000030 2014-01-01 0.0583910000000000000 2015-01-01 0.2341710000000000000 2016-01-01 0.4179330000000000000