Year	Percent
1998-01-01	14.59850
1999-01-01	19.87710
2000-01-01	29.81120
2001-01-01	26.63240
2002-01-01	27.55730
2003-01-01	34.33910
2004-01-01	43.13250
2005-01-01	35.01830
2006-01-01	27.98280
2007-01-01	28.27710
2008-01-01	18.04920
2009-01-01	11.40010
2010-01-01	12.35530
2011-01-01	8.81366
2012-01-01	8.47478