Year	Percent
1960-01-01	5.4437900000000000
1961-01-01	5.4915699999999990
1962-01-01	6.7051600000000000
1963-01-01	4.7716100000000000
1964-01-01	2.3868800000000000
1965-01-01	2.4502200000000003
1966-01-01	1.6014800000000000
1967-01-01	0.8605770000000000
1968-01-01	5.3445599999999995
1969-01-01	12.0103000000000000
1970-01-01	8.1342300000000000
1971-01-01	8.3700400000000000
1972-01-01	10.1168000000000000
1973-01-01	9.2824500000000000
1974-01-01	12.2837000000000000
1975-01-01	17.9015000000000000
1976-01-01	21.6601000000000000
1977-01-01	17.9274000000000000
1978-01-01	17.4995000000000000
1979-01-01	17.5393000000000000
1980-01-01	18.4198000000000000
1981-01-01	18.7774000000000000
1982-01-01	18.9094000000000000
1983-01-01	18.1925000000000000
1984-01-01	13.8865000000000000
1985-01-01	11.9763000000000000
1986-01-01	13.3143000000000000
1987-01-01	13.5051000000000000
1988-01-01	12.3220000000000010
1989-01-01	10.1528000000000000
1990-01-01	9.4799500000000000
1991-01-01	9.3376100000000000
1992-01-01	9.9487399999999990
1993-01-01	9.8878000000000000
1994-01-01	7.0789800000000005
1995-01-01	6.6090200000000000
1996-01-01	9.0089100000000000
1997-01-01	9.9936100000000000
1998-01-01	11.7259999999999990
1999-01-01	12.8115000000000000
2000-01-01	13.5068000000000000
2001-01-01	12.4052000000000000
2002-01-01	14.0554000000000000
2003-01-01	16.4614000000000000
2004-01-01	17.1880000000000000
2005-01-01	15.5902000000000000
2006-01-01	14.7702000000000000
2007-01-01	15.2081000000000000
2008-01-01	15.2733000000000000
2009-01-01	14.8724000000000000
2010-01-01	15.0438000000000000
2011-01-01	15.4065000000000000
2012-01-01	17.1607000000000000
2013-01-01	17.7585000000000000
2014-01-01	18.9048000000000000
2015-01-01	20.7605000000000000
2016-01-01	22.6212000000000000