Year	Percent
1998-01-01	12.190000000000000
1999-01-01	8.323240000000000
2000-01-01	5.038780000000000
2001-01-01	4.715580000000000
2002-01-01	3.477100000000000
2003-01-01	4.556450000000000
2004-01-01	6.561310000000001
2005-01-01	11.770900000000000
2006-01-01	10.417800000000000
2007-01-01	6.997420000000000
2008-01-01	6.481650000000000
2009-01-01	2.812970000000000
2010-01-01	1.750000000000000
2011-01-01	1.285380000000000
2012-01-01	0.902495000000000