Year Percent Change From Preceding Period 2004-01-01 7.21071567768261 2005-01-01 6.45475628048161 2006-01-01 4.66057099553069 2007-01-01 8.46438124147740 2008-01-01 5.56659564816220 2009-01-01 5.38234616845811 2010-01-01 6.35888608148874 2011-01-01 7.90450757225126 2012-01-01 5.14101362081972 2013-01-01 7.26306003021543 2014-01-01 6.96513435957574 2015-01-01 6.95429101605434 2016-01-01 6.95301080320297 2017-01-01 5.99999999999975 2018-01-01 5.80000000000027 2019-01-01 6.59999999999999