Year	Percent
1998-01-01	4.88270169899249
1999-01-01	4.78411848945831
2000-01-01	4.47689025599882
2001-01-01	4.07095688741035
2002-01-01	3.87807161625373
2003-01-01	3.72102490301230
2004-01-01	3.49752513592375
2005-01-01	3.29992308281989
2006-01-01	2.90640260141716
2007-01-01	2.59016720536544
2008-01-01	2.85870911313158
2009-01-01	3.07601715894266
2010-01-01	3.20282240892021
2011-01-01	3.20214504093612
2012-01-01	4.09681175478291
2013-01-01	4.52525102326154