Year	Percent
1990-01-01	3.7450099999999997
1991-01-01	3.3115900000000003
1992-01-01	3.4461500000000000
1993-01-01	3.4173900000000000
1994-01-01	6.6582500000000000
1995-01-01	6.3928900000000000
1996-01-01	7.6564000000000000
1997-01-01	8.7733000000000000
1998-01-01	10.4544000000000000
1999-01-01	11.8286000000000000
2000-01-01	13.6380000000000000
2001-01-01	12.5992000000000000
2002-01-01	12.0303000000000000
2003-01-01	10.6150000000000000
2004-01-01	10.1423000000000000
2005-01-01	10.6428000000000000
2006-01-01	12.1564000000000000
2007-01-01	14.6986000000000000
2008-01-01	9.6911000000000000
2009-01-01	8.4730100000000000
2010-01-01	8.4372200000000000
2011-01-01	8.0279400000000000
2012-01-01	8.5107800000000000
2013-01-01	8.3633399999999990
2014-01-01	7.8713800000000000
2015-01-01	9.2519600000000000