Year	Percent
1980-01-01	0.3757180000000000
1981-01-01	1.7943700000000000
1982-01-01	1.4980000000000002
1983-01-01	1.9496099999999998
1984-01-01	2.5092300000000000
1985-01-01	3.2512600000000000
1986-01-01	2.2976600000000000
1987-01-01	2.5254900000000000
1988-01-01	2.1843100000000000
1989-01-01	3.0058000000000000
1990-01-01	1.4767400000000000
1991-01-01	1.8064500000000000
1992-01-01	1.4002500000000000
1993-01-01	1.6775700000000000
1994-01-01	1.9454500000000000
1995-01-01	1.6525599999999998
1996-01-01	1.6519099999999998
1997-01-01	1.3110800000000000
1998-01-01	0.7757740000000000
1999-01-01	1.1307000000000000
2000-01-01	2.7776500000000000
2001-01-01	4.4301600000000000
2002-01-01	3.0210900000000000
2003-01-01	3.2681800000000000
2004-01-01	3.8941000000000000
2005-01-01	3.3655000000000000
2006-01-01	2.2891600000000000
2007-01-01	2.5390900000000003
2008-01-01	2.1897100000000000
2009-01-01	3.2928599999999997
2010-01-01	2.9274200000000000
2011-01-01	2.9418500000000000
2012-01-01	3.2003100000000000
2013-01-01	2.7602200000000000
2014-01-01	2.1775700000000002
2015-01-01	3.8971100000000000
2016-01-01	3.5678099999999997