Year	Percent
1990-01-01	20.1180
1991-01-01	21.5884
1992-01-01	27.6145
1993-01-01	32.7721
1994-01-01	33.6841
1995-01-01	38.6397
1996-01-01	40.3612
1997-01-01	41.6763
1998-01-01	42.9232
1999-01-01	42.5402
2000-01-01	37.6491
2001-01-01	37.7046
2002-01-01	33.7710
2003-01-01	35.2328
2004-01-01	35.0192
2005-01-01	35.9344
2006-01-01	36.8610
2007-01-01	38.7365
2008-01-01	39.0649
2009-01-01	51.4302
2010-01-01	60.6745
2011-01-01	61.1400
2012-01-01	55.9724
2013-01-01	53.5070
2014-01-01	52.4602
2015-01-01	50.0264
2016-01-01	47.0513