Year	Percent
1999-01-01	10.8016
2000-01-01	12.2619
2001-01-01	13.1470
2002-01-01	16.3474
2003-01-01	19.3484
2004-01-01	20.6761
2005-01-01	22.0662
2006-01-01	15.7693
2007-01-01	19.7781
2008-01-01	21.4875
2009-01-01	24.6577
2010-01-01	23.3307
2011-01-01	23.1205
2012-01-01	30.0618
2013-01-01	32.4973
2014-01-01	36.6862
2015-01-01	40.5624