Year	Percent
1999-01-01	6.691750000000000
2000-01-01	5.708120000000000
2001-01-01	4.897069999999999
2002-01-01	5.351300000000000
2003-01-01	5.541170000000000
2004-01-01	7.756539999999999
2005-01-01	12.691400000000000
2006-01-01	16.920800000000000
2007-01-01	24.267500000000000
2008-01-01	17.683300000000000
2009-01-01	22.336300000000000
2010-01-01	23.807600000000000
2011-01-01	21.178000000000000
2012-01-01	20.152400000000000
2013-01-01	22.015200000000000
2014-01-01	20.511700000000000
2015-01-01	20.315300000000000
2016-01-01	22.576100000000000
2017-01-01	25.428500000000000