Year	Percent
1998-01-01	19.2883
1999-01-01	21.2421
2000-01-01	33.0000
2001-01-01	26.6000
2002-01-01	20.9313
2003-01-01	20.1761
2004-01-01	29.2284
2005-01-01	33.1680
2006-01-01	33.4013
2007-01-01	25.0321
2008-01-01	32.5090
2009-01-01	26.4058
2010-01-01	30.4223
2011-01-01	32.5062
2012-01-01	28.5613