Year	Percent
2000-01-01	16.10611608239660
2001-01-01	18.24322211653970
2002-01-01	19.93271684088140
2003-01-01	19.61964051957800
2004-01-01	18.97837409926570
2005-01-01	17.75268703260570
2006-01-01	13.84889329381710
2007-01-01	9.60760523854493
2008-01-01	7.12099462420450
2009-01-01	8.16637164298252
2010-01-01	9.64034635503099
2011-01-01	9.63281523586770
2012-01-01	10.08882080186310
2013-01-01	10.32861949665930
2014-01-01	8.99087202737545
2015-01-01	7.50308016151202
2016-01-01	6.16170316787172
2017-01-01	4.88723888573846