Year	Percent
1998-01-01	8.20601548753070
1999-01-01	10.46588355872180
2000-01-01	10.53276444043080
2001-01-01	9.85029111535254
2002-01-01	9.02386196486366
2003-01-01	9.87447590145426
2004-01-01	9.90045554020040
2005-01-01	9.79106657345586
2006-01-01	8.84389887837819
2007-01-01	6.73698528211296
2008-01-01	5.61237923661374
2009-01-01	7.72577945198284
2010-01-01	8.45562892140795
2011-01-01	7.89474720731105
2012-01-01	8.20393946713937
2013-01-01	8.28802593557152
2014-01-01	7.39557112517946
2015-01-01	6.07446938717814
2016-01-01	4.67355985410516
2017-01-01	3.58090124515483