Year	Percent
1991-01-01	52.0724
1992-01-01	49.1855
1993-01-01	21.1110
1994-01-01	14.9819
1995-01-01	13.9301
1996-01-01	17.0439
1997-01-01	18.6642
1998-01-01	18.1365
1999-01-01	14.4891
2000-01-01	13.8685
2001-01-01	16.4079
2002-01-01	19.0354
2003-01-01	21.2039
2004-01-01	23.1447
2005-01-01	24.9281
2006-01-01	27.7454
2007-01-01	33.0843
2008-01-01	37.4447
2009-01-01	40.2949
2010-01-01	36.7374
2011-01-01	36.1981
2012-01-01	40.1662
2013-01-01	42.3627
2014-01-01	40.5218
2015-01-01	37.0849
2016-01-01	32.5564