Year	Percent
1996-01-01	44.126000000000005
1997-01-01	45.176900000000000
1998-01-01	44.257600000000000
1999-01-01	41.800400000000000
2000-01-01	39.276300000000000
2001-01-01	36.476500000000000
2002-01-01	35.429700000000000
2003-01-01	36.370900000000000
2004-01-01	30.805300000000000
2005-01-01	30.254200000000000
2006-01-01	35.147600000000000
2007-01-01	31.667400000000000
2008-01-01	31.910500000000000
2009-01-01	26.111900000000000
2010-01-01	26.032400000000000
2011-01-01	24.055500000000000
2012-01-01	23.809700000000000
2013-01-01	21.146500000000000
2014-01-01	21.894300000000000
2015-01-01	21.991600000000000
2016-01-01	24.570400000000000