Year	Percent
1977-01-01	0.090692000000000000
1978-01-01	0.620675000000000000
1979-01-01	0.529094000000000000
1980-01-01	0.408242999999999970
1981-01-01	0.334696999999999970
1982-01-01	0.311091000000000000
1983-01-01	0.361464000000000000
1984-01-01	0.366592000000000030
1985-01-01	0.419847000000000000
1986-01-01	0.470154000000000000
1987-01-01	0.516297999999999900
1988-01-01	0.076616999999999990
1989-01-01	0.071990000000000000
1990-01-01	0.065620000000000000
1991-01-01	0.058863000000000000
1992-01-01	0.055265999999999996
1993-01-01	0.132004999999999980
1994-01-01	1.118520000000000200
1995-01-01	24.749400000000000000
1996-01-01	24.724100000000000000
1997-01-01	24.071400000000000000
1998-01-01	22.650400000000000000
1999-01-01	32.150200000000000000
2000-01-01	54.802100000000000000
2001-01-01	26.274800000000000000
2002-01-01	21.993800000000000000
2003-01-01	19.353800000000000000
2004-01-01	17.148700000000000000
2005-01-01	17.134400000000000000
2006-01-01	13.614800000000000000
2007-01-01	12.492200000000000000
2008-01-01	10.316900000000000000
2009-01-01	5.279940000000000000
2010-01-01	4.268540000000000000
2011-01-01	2.925200000000000000
2012-01-01	2.353150000000000000
2013-01-01	1.564180000000000000
2014-01-01	2.862580000000000000
2015-01-01	3.773780000000000400
2016-01-01	6.588319999999999500