Year	Percent
1999-01-01	1.9392000000000000
2000-01-01	1.8100200000000000
2001-01-01	1.2638700000000000
2002-01-01	2.8605500000000000
2003-01-01	3.6622100000000000
2004-01-01	4.3005100000000000
2005-01-01	5.2064900000000005
2006-01-01	6.7082500000000000
2007-01-01	7.1422100000000000
2008-01-01	12.8860000000000000
2009-01-01	14.6630000000000000
2010-01-01	14.3640000000000000
2011-01-01	12.0670000000000000
2012-01-01	13.7180000000000000
2013-01-01	17.8200000000000000