Year	Percent
1998-01-01	4.1315200000000000
1999-01-01	2.1950200000000000
2000-01-01	4.3763000000000000
2001-01-01	4.3568200000000000
2002-01-01	5.2458700000000000
2003-01-01	7.3723600000000005
2004-01-01	11.9834000000000000
2005-01-01	21.4871000000000000
2006-01-01	31.0531000000000000
2007-01-01	51.5655000000000000
2008-01-01	40.2218000000000000
2009-01-01	14.4687000000000000
2010-01-01	27.5592000000000000
2011-01-01	20.1701000000000000
2012-01-01	13.0996000000000000