Year	Percent
1999-01-01	34.8250
2000-01-01	32.3104
2001-01-01	31.3412
2002-01-01	26.8099
2003-01-01	31.0154
2004-01-01	31.2178
2005-01-01	32.6757
2006-01-01	37.9829
2007-01-01	41.6680
2008-01-01	23.0513
2009-01-01	35.0163
2010-01-01	35.7436
2011-01-01	32.5307
2012-01-01	38.5091
2013-01-01	46.4930
2014-01-01	52.7692
2015-01-01	60.2464
2016-01-01	66.1279