Year	Percent
1990-01-01	2.0180300000000000
1991-01-01	1.8644900000000002
1992-01-01	2.0504599999999997
1993-01-01	2.7506800000000000
1994-01-01	3.4557000000000000
1995-01-01	2.4467100000000000
1996-01-01	2.4548900000000002
1997-01-01	2.8923600000000000
1998-01-01	4.0921100000000000
1999-01-01	4.0341400000000000
2000-01-01	4.5295200000000000
2001-01-01	3.0556000000000000
2002-01-01	1.6635000000000000
2003-01-01	1.3822700000000000
2004-01-01	1.1405299999999998
2005-01-01	1.5839000000000000
2006-01-01	2.7815500000000000
2007-01-01	4.4946199999999990
2008-01-01	6.0665200000000000
2009-01-01	7.4942400000000000
2010-01-01	8.1362399999999990
2011-01-01	9.5405300000000000
2012-01-01	13.9825000000000000
2013-01-01	15.7682000000000000
2014-01-01	15.8212000000000000
2015-01-01	16.1593000000000000
2016-01-01	17.5584000000000000