Year	Percent
1999-01-01	44.629200000000000
2000-01-01	37.486200000000000
2001-01-01	40.010300000000000
2002-01-01	42.449200000000000
2003-01-01	39.513500000000000
2004-01-01	36.905400000000000
2005-01-01	32.058800000000000
2006-01-01	29.930100000000000
2007-01-01	29.441999999999997
2008-01-01	27.255900000000000
2009-01-01	39.755200000000000
2010-01-01	41.387900000000000
2011-01-01	43.517500000000000
2012-01-01	49.459200000000000
2013-01-01	48.002100000000000
2014-01-01	50.408500000000000
2015-01-01	57.206500000000000
2016-01-01	66.143500000000000