Year	Percent
1980-01-01	0.30684400000000000
1981-01-01	0.25484800000000000
1982-01-01	0.29394800000000000
1983-01-01	0.35212400000000000
1984-01-01	0.31746100000000000
1985-01-01	0.48380600000000000
1986-01-01	0.31720400000000000
1987-01-01	0.34131700000000000
1988-01-01	0.28740100000000000
1989-01-01	0.21308900000000000
1990-01-01	0.20055300000000000
1991-01-01	0.77332800000000000
1992-01-01	0.65017100000000000
1993-01-01	0.61035800000000000
1994-01-01	0.54117500000000000
1995-01-01	0.42008999999999996
1996-01-01	0.42008999999999996
1997-01-01	0.42008999999999996
1998-01-01	0.42008999999999996
1999-01-01	0.65733900000000000
2000-01-01	0.63047000000000000
2001-01-01	1.60433999999999990
2002-01-01	3.06404000000000030
2003-01-01	4.28496000000000000
2004-01-01	3.85114000000000000
2005-01-01	2.76238000000000000
2006-01-01	2.21205999999999970
2007-01-01	1.57883000000000000
2008-01-01	1.22277000000000010
2009-01-01	1.02171000000000010
2010-01-01	1.51036000000000010
2011-01-01	1.78045000000000000
2012-01-01	2.01289000000000000
2013-01-01	1.53204000000000000
2014-01-01	2.37151000000000000
2015-01-01	3.08230999999999970
2016-01-01	4.07299000000000000