Year	Percent
1999-01-01	1.7760000000000000
2000-01-01	1.9709999999999999
2001-01-01	1.8380000000000000
2002-01-01	2.4240000000000000
2003-01-01	2.8430000000000000
2004-01-01	2.9619999999999997
2005-01-01	2.7579000000000000
2006-01-01	3.2221700000000000
2007-01-01	3.9211500000000000
2008-01-01	3.4133400000000003
2009-01-01	3.4752600000000000
2010-01-01	5.1173600000000000