Year	Percent
1999-01-01	2.1681900000000000
2000-01-01	3.2581800000000000
2001-01-01	3.7743900000000004
2002-01-01	4.2113500000000000
2003-01-01	6.5985700000000000
2004-01-01	6.5151300000000000
2005-01-01	7.4373300000000000
2006-01-01	9.5362000000000000
2007-01-01	10.5075000000000000
2008-01-01	7.4054300000000000
2009-01-01	10.8867000000000000
2010-01-01	10.7156000000000000
2011-01-01	10.6756000000000000
2012-01-01	11.6398000000000000
2013-01-01	11.4935000000000000
2014-01-01	13.1999000000000000
2015-01-01	13.7036000000000000
2016-01-01	14.4121000000000000