Year	Percent
1996-01-01	3.3005100000000000
1997-01-01	3.1908900000000000
1998-01-01	3.0992900000000003
1999-01-01	2.9854400000000000
2000-01-01	2.9288500000000000
2001-01-01	3.1651900000000000
2002-01-01	3.5230400000000000
2003-01-01	3.7072300000000005
2004-01-01	3.6398000000000000
2005-01-01	3.5067900000000000
2006-01-01	3.4382000000000000
2007-01-01	3.3111500000000000
2008-01-01	3.2003700000000000
2009-01-01	3.2064600000000000
2010-01-01	3.0471100000000000
2011-01-01	3.0974000000000000
2012-01-01	3.1160799999999997
2013-01-01	3.1717400000000002
2014-01-01	3.1627500000000000
2015-01-01	3.1910000000000003
2016-01-01	3.2104200000000000