Year	Percent
1980-01-01	0.1467700000000000
1981-01-01	0.0230660000000000
1982-01-01	0.3082300000000000
1983-01-01	0.5818820000000000
1984-01-01	0.5199670000000000
1985-01-01	1.8357700000000001
1986-01-01	1.6962700000000002
1987-01-01	2.8075500000000000
1988-01-01	1.1761700000000002
1989-01-01	1.0139500000000000
1990-01-01	1.4553300000000000
1991-01-01	3.0854300000000000
1992-01-01	4.1578300000000010
1993-01-01	3.5580400000000000
1994-01-01	2.0307600000000000
1995-01-01	1.7907500000000000
1996-01-01	3.0753800000000000
1997-01-01	2.5947200000000000
1998-01-01	3.6785500000000000
1999-01-01	5.6511100000000000
2000-01-01	4.5235600000000000
2001-01-01	6.0837800000000000
2002-01-01	5.2054599999999995
2003-01-01	5.8507300000000000
2004-01-01	5.5367000000000000
2005-01-01	3.0617099999999997
2006-01-01	2.9658800000000000
2007-01-01	3.1904900000000000
2008-01-01	2.6928500000000000
2009-01-01	4.2654500000000000
2010-01-01	5.6380300000000005
2011-01-01	7.2911500000000000
2012-01-01	7.6092200000000000
2013-01-01	7.7878700000000000
2014-01-01	8.5945600000000010
2015-01-01	14.7243000000000000
2016-01-01	15.3354000000000000