Year	Percent
1960-01-01	0.4496202963898490
1961-01-01	0.4824335906308930
1962-01-01	0.8959466473398120
1963-01-01	2.8763224621267100
1964-01-01	3.0963815124573600
1965-01-01	3.3336793292934400
1966-01-01	3.3316797725456800
1967-01-01	2.1661569873985500
1968-01-01	2.6254290896315800
1969-01-01	2.2944343704715700
1970-01-01	4.6393534438994200
1971-01-01	4.6722149804140500
1972-01-01	5.2256805055554400
1973-01-01	6.0680983591020200
1974-01-01	9.5406554166058900
1975-01-01	10.7176711339198000
1976-01-01	9.7973464371629600
1977-01-01	6.7054941145065800
1978-01-01	3.0946607742464800
1979-01-01	4.5465277904216700
1980-01-01	6.2999000624459300
1981-01-01	8.0729437593459900
1982-01-01	9.3570509942738500
1983-01-01	8.6692715980851500
1984-01-01	6.4358578078699500
1985-01-01	4.0935877853009600
1986-01-01	0.2945634085454380
1987-01-01	-0.0566629093891733
1988-01-01	1.4365905663490400
1989-01-01	3.3709588729044800
1990-01-01	3.2537665908363600
1991-01-01	3.1183565987485400
1992-01-01	3.1541737596179300
1993-01-01	3.5880981853516300
1994-01-01	2.1947646868906600
1995-01-01	1.8676942496910800
1996-01-01	1.1838596884356900
1997-01-01	1.3675126120794300
1998-01-01	0.9585701104946390
1999-01-01	1.0251967647493400
2000-01-01	3.1507670702259200
2001-01-01	2.6638211057910300
2002-01-01	2.0740861357164400
2003-01-01	2.0498403056351500
2004-01-01	2.2256791642889200
2005-01-01	2.4876966516408600
2006-01-01	2.6663149457707200
2007-01-01	2.3124586178612800
2008-01-01	3.4018796302556600
2009-01-01	0.3680419978889190
2010-01-01	2.2736791162154200
2011-01-01	3.4106834106834000
2012-01-01	2.6628416550801700
2013-01-01	1.7340396351916600
2014-01-01	0.6285439854407050
2015-01-01	0.4747431614378000
2016-01-01	0.2908333333333060
2017-01-01	1.7307995911889700