Year	Percent
1999-01-01	8.417589999999999
2000-01-01	8.055180000000000
2001-01-01	7.769350000000000
2002-01-01	8.363550000000000
2003-01-01	9.695120000000000
2004-01-01	10.545700000000000
2005-01-01	11.487100000000000
2006-01-01	10.023500000000000
2007-01-01	9.494390000000000
2008-01-01	6.686330000000000
2009-01-01	7.486880000000000
2010-01-01	8.826910000000000
2011-01-01	8.434360000000000
2012-01-01	10.268900000000000
2013-01-01	12.376500000000000
2014-01-01	13.302000000000000
2015-01-01	14.861700000000000
2016-01-01	16.018400000000000