Year	Percent
1998-01-01	5.3744300000000000
1999-01-01	17.8881000000000000
2000-01-01	21.0643000000000000
2001-01-01	13.6413000000000000
2002-01-01	5.6990600000000000
2003-01-01	2.8568900000000000
2004-01-01	2.5812900000000000
2005-01-01	3.5647699999999998
2006-01-01	3.5829199999999997
2007-01-01	2.7404400000000000
2008-01-01	3.5029900000000000
2009-01-01	3.4816599999999998
2010-01-01	7.5730699999999995
2011-01-01	3.5786100000000000
2012-01-01	5.2106300000000000