Year	Percent
1998-01-01	27.7512
1999-01-01	41.3923
2000-01-01	52.7000
2001-01-01	20.9000
2002-01-01	11.1911
2003-01-01	41.9410
2004-01-01	46.8411
2005-01-01	40.0352
2006-01-01	38.9023
2007-01-01	47.2355
2008-01-01	52.1023
2009-01-01	43.2888
2010-01-01	31.4303
2011-01-01	35.7687
2012-01-01	42.6018
2013-01-01	14.2586
2014-01-01	38.3648
2015-01-01	43.2771