Year Percent Change From Preceding Period 2004-01-01 7.52404092071643 2005-01-01 6.99999999999966 2006-01-01 11.91093169934210 2007-01-01 11.65885459337590 2008-01-01 9.38834799759811 2009-01-01 9.70809861730898 2010-01-01 6.61773426361544 2011-01-01 11.44924125260370 2012-01-01 7.70909175793935 2013-01-01 8.49420746777055 2014-01-01 7.66066053803317 2015-01-01 8.03891159638015 2016-01-01 12.51773680245080 2017-01-01 13.89396620818920 2018-01-01 27.00000000000020 2019-01-01 22.00000000000000