Year	Percent
1999-01-01	1.8379400000000001
2000-01-01	1.5405700000000000
2001-01-01	2.6036799999999998
2002-01-01	2.8874800000000000
2003-01-01	3.2943000000000000
2004-01-01	4.3157200000000000
2005-01-01	3.6599300000000000
2006-01-01	4.1818700000000000
2007-01-01	3.2240100000000000
2008-01-01	2.9182900000000003
2009-01-01	4.1431000000000000
2010-01-01	4.1965300000000000
2011-01-01	3.6607500000000000
2012-01-01	10.1314000000000000
2013-01-01	10.0056000000000000
2014-01-01	20.3374000000000000
2015-01-01	22.6735000000000000
2016-01-01	25.3196000000000000