Year	Percent
1998-01-01	7.200000000000000
1999-01-01	7.300000000000000
2000-01-01	6.500000000000000
2001-01-01	5.900000000000000
2002-01-01	5.500000000000000
2003-01-01	5.300000000000000
2004-01-01	5.100000000000000
2005-01-01	4.700000000000000
2006-01-01	4.500000000000000
2007-01-01	4.600000000000000
2008-01-01	3.700000000000000
2009-01-01	5.400000000000000
2010-01-01	5.323119999999999
2011-01-01	6.439530000000000
2012-01-01	7.279200000000000
2013-01-01	7.748780000000000
2014-01-01	12.696200000000000
2015-01-01	13.973800000000000
2016-01-01	13.526500000000000