Year	Percent
1993-01-01	57.9853
1994-01-01	50.7412
1995-01-01	45.5992
1996-01-01	49.5091
1997-01-01	59.8596
1998-01-01	64.4770
1999-01-01	62.1605
2000-01-01	60.6706
2001-01-01	62.9069
2002-01-01	62.8950
2003-01-01	56.5939
2004-01-01	49.7503
2005-01-01	49.5371
2006-01-01	50.3981
2007-01-01	47.4113
2008-01-01	50.8992
2009-01-01	60.8779
2010-01-01	62.3672
2011-01-01	63.1179
2012-01-01	63.7233
2013-01-01	63.8996
2014-01-01	63.7844
2015-01-01	65.3521
2016-01-01	67.7003