Year	Percent
1999-12-31	3.4457
2000-12-31	4.4024
2001-12-31	4.2693
2002-12-31	3.3189
2003-12-31	2.3309
2004-12-31	2.1066
2005-12-31	2.184
2006-12-31	3.0807
2007-12-31	4.2765
2008-12-31	4.6418
2009-12-31	1.222
2010-12-31	0.8135
2011-12-31	1.3942
2012-12-31	0.5711
2013-12-31	0.2205
2014-12-31	0.2082
2015-12-31	-0.0197
2016-12-31	-0.2645
2017-12-31	-0.3291
2018-12-31	-0.3221
2019-12-31	-0.3571
2020-12-31	-0.4274