Year	Percent
1960-01-01	2.3239436619722100
1961-01-01	1.3076393668273400
1962-01-01	2.4311452004646000
1963-01-01	3.2436593276263900
1964-01-01	5.8237664687615100
1965-01-01	3.9080263939366200
1966-01-01	5.7621465538998400
1967-01-01	3.4553200529418300
1968-01-01	3.7207917707475800
1969-01-01	7.4217973638689000
1970-01-01	3.6689182018405400
1971-01-01	7.4776925520413900
1972-01-01	7.8027914345622100
1973-01-01	8.0222037496608900
1974-01-01	9.5914248432510500
1975-01-01	10.2174805273043000
1976-01-01	8.8306435590572900
1977-01-01	6.3993031903923800
1978-01-01	4.1120131687587100
1979-01-01	4.1992929622273000
1980-01-01	6.5134568629721800
1981-01-01	6.7389295507844300
1982-01-01	5.9110932398492100
1983-01-01	2.7408428254343600
1984-01-01	3.3016384199798000
1985-01-01	2.2585840125526600
1986-01-01	0.0833479494867193
1987-01-01	-0.6912030913368040
1988-01-01	0.7379430457475330
1989-01-01	1.0821601557778000
1990-01-01	2.4540898591967200
1991-01-01	3.1581975185909600
1992-01-01	3.1835856949958000
1993-01-01	2.5841811563471500
1994-01-01	2.8015269367219300
1995-01-01	1.9232245716635600
1996-01-01	2.1137878706677600
1997-01-01	2.1092456273948000
1998-01-01	1.9591363227425600
1999-01-01	2.1571791805505600
2000-01-01	2.3605223380195600
2001-01-01	4.1558412719561100
2002-01-01	3.2875310471276800
2003-01-01	2.0919983899765800
2004-01-01	1.2636473918317700
2005-01-01	1.6881301786962200
2006-01-01	1.1015010651770400
2007-01-01	1.6138585980210300
2008-01-01	2.4865019828945400
2009-01-01	1.1897768702154900
2010-01-01	1.2753056955668600
2011-01-01	2.3410701775137000
2012-01-01	2.4555476529160900
2013-01-01	2.5068985265788400
2014-01-01	0.9760350796996610
2015-01-01	0.6002481472787750
2016-01-01	0.3166666666666630
2017-01-01	1.3814587140721000