Year	Percent
1997-01-01	0.321010000000000
1998-01-01	0.298349000000000
1999-01-01	34.346700000000000
2000-01-01	42.736999999999995
2001-01-01	47.982900000000000
2002-01-01	49.360500000000000
2003-01-01	42.679900000000000
2004-01-01	56.494200000000000
2005-01-01	51.812000000000000
2006-01-01	61.255500000000000
2007-01-01	66.143100000000000
2008-01-01	59.428300000000000
2009-01-01	72.146300000000000
2010-01-01	59.443800000000000
2011-01-01	49.472100000000000
2012-01-01	60.277400000000000
2013-01-01	55.785900000000000
2014-01-01	52.094600000000000
2015-01-01	55.523100000000000
2016-01-01	54.554500000000000