Year	Percent
1999-01-01	17.15686035
2000-01-01	21.56066513
2001-01-01	16.02673912
2002-01-01	19.62509537
2003-01-01	19.44338799
2004-01-01	18.20775414
2005-01-01	16.74102211
2006-01-01	26.37020874
2007-01-01	29.20795059
2008-01-01	15.07267284
2009-01-01	11.47846699
2010-01-01	11.03228951
2011-01-01	11.56829739
2012-01-01	12.47640991
2013-01-01	11.09096813