Year Percent Change From Preceding Period 2004-01-01 5.257003621698640 2005-01-01 4.755845096763990 2006-01-01 5.398508449998120 2007-01-01 6.420003538707550 2008-01-01 7.206558522945260 2009-01-01 -4.726260339487660 2010-01-01 0.263043438025203 2011-01-01 1.454523932648670 2012-01-01 3.027439697389090 2013-01-01 2.255204043260720 2014-01-01 3.315854155152290 2015-01-01 3.116614723486760 2016-01-01 4.179990237300760 2017-01-01 4.170794763281450 2018-01-01 4.982423862812140 2019-01-01 5.411998924955980