Year	Percent
1995-01-01	47.1082487884746
1996-01-01	47.1504244134985
1997-01-01	48.1574063711592
1998-01-01	48.6518925286068
1999-01-01	49.7113145594004
2000-01-01	50.8842539262927
2001-01-01	51.1676067451132
2002-01-01	53.3687777008679
2003-01-01	56.5773114898603
2004-01-01	57.3023385603585
2005-01-01	57.9153030638338
2006-01-01	58.5985080615832
2007-01-01	60.0306117117107
2008-01-01	60.4670291569562
2009-01-01	61.5738760845300
2010-01-01	62.1530901734248
2011-01-01	62.5448828869019
2012-01-01	63.3351496473889
2013-01-01	64.3878292261785
2014-01-01	64.3962733514379
2015-01-01	64.8059925038661
2016-01-01	65.8166327157450
2017-01-01	66.0060035521313