Year	Percent
1990-01-01	38.4785
1991-01-01	40.8645
1992-01-01	40.7322
1993-01-01	41.1196
1994-01-01	42.5126
1995-01-01	41.9240
1996-01-01	41.8546
1997-01-01	49.8963
1998-01-01	59.7970
1999-01-01	60.4350
2000-01-01	47.3077
2001-01-01	52.3664
2002-01-01	65.2322
2003-01-01	68.8956
2004-01-01	71.0344
2005-01-01	67.3207
2006-01-01	68.7398
2007-01-01	74.2743
2008-01-01	80.2158
2009-01-01	72.9855
2010-01-01	74.8404
2011-01-01	69.6156
2012-01-01	62.3022
2013-01-01	58.1987
2014-01-01	53.8906
2015-01-01	58.9073
2016-01-01	55.1908