Year	Percent
1960-01-01	1.536617039788710
1961-01-01	2.293697155662140
1962-01-01	2.843271924946660
1963-01-01	2.966958325308370
1964-01-01	2.335723499494950
1965-01-01	3.242322812806470
1966-01-01	3.533055523571950
1967-01-01	1.796052206140400
1968-01-01	1.470311644034260
1969-01-01	1.912666559285560
1970-01-01	3.450227843623720
1971-01-01	5.240979842300570
1972-01-01	5.484942487578440
1973-01-01	7.032018252629060
1974-01-01	6.986426985188830
1975-01-01	5.910339333745750
1976-01-01	4.246631855081830
1977-01-01	3.734168504708750
1978-01-01	2.718691505148060
1979-01-01	4.043621618809480
1980-01-01	5.441054605994030
1981-01-01	6.344245378500530
1982-01-01	5.241043941380720
1983-01-01	3.293412780538670
1984-01-01	2.405795378966500
1985-01-01	2.066239021517340
1986-01-01	-0.129416442513556
1987-01-01	0.249910957391677
1988-01-01	1.274117481212200
1989-01-01	2.780562482116480
1990-01-01	2.696469975508480
1991-01-01	4.047031827448530
1992-01-01	5.056980056980050
1993-01-01	4.474576271186450
1994-01-01	2.693056456846200
1995-01-01	1.706161137440770
1996-01-01	1.449725587656620
1997-01-01	1.939369194651410
1998-01-01	0.911184539901888
1999-01-01	0.585433617781321
2000-01-01	1.440268323961710
2001-01-01	1.983856851113480
2002-01-01	1.420806713073350
2003-01-01	1.034223392252700
2004-01-01	1.665736087846650
2005-01-01	1.546910755148730
2006-01-01	1.577429241031220
2007-01-01	2.298340580353150
2008-01-01	2.628383067314360
2009-01-01	0.312737722931282
2010-01-01	1.103808560835860
2011-01-01	2.075172931077590
2012-01-01	2.008491182233830
2013-01-01	1.504722266688010
2014-01-01	0.906797035167963
2015-01-01	0.234429944518262
2016-01-01	0.483355422156377
2017-01-01	1.737916052447820