Year	Percent
1990-01-01	15.7839
1991-01-01	12.9882
1992-01-01	13.9115
1993-01-01	15.2496
1994-01-01	14.4972
1995-01-01	13.0133
1996-01-01	11.8615
1997-01-01	8.5642
1998-01-01	14.1465
1999-01-01	21.3057
2000-01-01	20.7284
2001-01-01	22.9480
2002-01-01	13.5318
2003-01-01	16.6852
2004-01-01	22.6056
2005-01-01	24.7299
2006-01-01	28.1449
2007-01-01	26.5466
2008-01-01	22.0950
2009-01-01	32.5390
2010-01-01	30.5049
2011-01-01	29.3393
2012-01-01	33.6731
2013-01-01	35.2112
2014-01-01	34.4043
2015-01-01	36.0319
2016-01-01	36.6051