Year	Percent
1998-01-01	25.5364000000000000
1999-01-01	19.1059000000000000
2000-01-01	17.4000000000000000
2001-01-01	16.8000000000000000
2002-01-01	12.0991000000000000
2003-01-01	9.9470900000000000
2004-01-01	8.6540200000000000
2005-01-01	7.1166800000000010
2006-01-01	4.9316699999999996
2007-01-01	3.4747500000000000
2008-01-01	4.8414500000000000
2009-01-01	2.7885600000000000
2010-01-01	3.3817300000000000
2011-01-01	5.0285300000000000
2012-01-01	4.6767800000000000