Year	Percent
1999-01-01	6.0016900000000000
2000-01-01	2.7123700000000000
2001-01-01	2.8139300000000000
2002-01-01	1.4469999999999998
2003-01-01	2.8714700000000000
2004-01-01	3.9876400000000003
2005-01-01	6.6584600000000010
2006-01-01	6.1204900000000000
2007-01-01	9.5006500000000000
2008-01-01	3.0249000000000000
2009-01-01	7.3031100000000000
2010-01-01	7.9431100000000010
2011-01-01	4.6910300000000005
2012-01-01	8.0666400000000000
2013-01-01	5.4963500000000000
2014-01-01	6.6270700000000000
2015-01-01	4.6767000000000000
2016-01-01	4.1107500000000000