Year Percent Change 2001-01-01 1.8777 2002-01-01 1.8995 2003-01-01 2.0631 2004-01-01 2.5378 2005-01-01 2.4380 2006-01-01 3.2253 2007-01-01 2.9669 2008-01-01 4.3450 2009-01-01 3.6649 2010-01-01 3.3390 2011-01-01 3.5482 2012-01-01 5.1386 2013-01-01 5.8045 2014-01-01 4.9237 2015-01-01 4.8508 2016-01-01 3.7275 2017-01-01 5.3209 2018-01-01 6.9626 2019-01-01 6.0720