Year	Percent
1996-01-01	42.517500000000000
1997-01-01	49.986500000000000
1998-01-01	49.268600000000000
1999-01-01	55.175500000000000
2000-01-01	60.334900000000000
2001-01-01	48.237400000000000
2002-01-01	42.099300000000000
2003-01-01	37.622400000000000
2004-01-01	37.137500000000000
2005-01-01	36.072300000000000
2006-01-01	44.800400000000000
2007-01-01	36.554000000000000
2008-01-01	28.677800000000000
2009-01-01	28.431700000000000
2010-01-01	29.279200000000000
2011-01-01	30.956999999999997
2012-01-01	24.390800000000000
2013-01-01	21.312600000000000
2014-01-01	22.468300000000000
2015-01-01	21.865800000000000
2016-01-01	18.640500000000000