Year	Percent
1998-01-01	57.6505325170056
1999-01-01	57.6259007501792
2000-01-01	51.7736542466122
2001-01-01	49.3590379792871
2002-01-01	48.7360912841857
2003-01-01	48.5335526544980
2004-01-01	48.4541037011954
2005-01-01	48.8036443744609
2006-01-01	49.5472551651425
2007-01-01	50.1933059265553
2008-01-01	50.9317216657016
2009-01-01	48.3009401785861
2010-01-01	48.1909959881943
2011-01-01	48.6940382725086
2012-01-01	48.3963162087578
2013-01-01	47.5347473971820