Year	Percent
1999-01-01	19.4269
2000-01-01	25.4954
2001-01-01	26.5986
2002-01-01	36.5082
2003-01-01	38.1853
2004-01-01	48.2998
2005-01-01	54.1338
2006-01-01	74.8752
2007-01-01	80.0711
2008-01-01	67.0549
2009-01-01	81.2489
2010-01-01	71.4193
2011-01-01	59.1295
2012-01-01	60.3844
2013-01-01	66.8621
2014-01-01	65.0971
2015-01-01	69.6961
2016-01-01	63.5306