Year	Percent
1960-01-01	0.697929233796472
1961-01-01	1.797704290092070
1962-01-01	2.680853969874640
1963-01-01	1.968498504418860
1964-01-01	3.474905476766080
1965-01-01	3.397489756110870
1966-01-01	2.755480775428140
1967-01-01	6.056920062675230
1968-01-01	4.311924965501930
1969-01-01	4.925242426951340
1970-01-01	6.517181051554800
1971-01-01	10.387568318813700
1972-01-01	6.932804592068530
1973-01-01	8.166669273266590
1974-01-01	11.109402012222500
1975-01-01	14.684983472399400
1976-01-01	16.906857005944900
1977-01-01	14.383549419462200
1978-01-01	11.956617973330300
1979-01-01	13.699595015664100
1980-01-01	17.150545424095400
1981-01-01	15.370159583185300
1982-01-01	16.163694123101800
1983-01-01	7.341075860573450
1984-01-01	6.171253479244430
1985-01-01	15.417655571991800
1986-01-01	13.213398064002100
1987-01-01	15.744300788892700
1988-01-01	6.375249444110550
1989-01-01	5.715991551356260
1990-01-01	6.098444148102070
1991-01-01	2.602392859997730
1992-01-01	1.014560271712340
1993-01-01	1.288207765743890
1994-01-01	1.745377907737410
1995-01-01	3.754944136775540
1996-01-01	2.285713054021950
1997-01-01	1.187148331056330
1998-01-01	1.265244099154070
1999-01-01	-0.114267129777519
2000-01-01	2.615234462463180
2001-01-01	2.625816303929010
2002-01-01	2.677092577116100
2003-01-01	1.753574447595530
2004-01-01	2.290249028475700
2005-01-01	3.037023326170150
2006-01-01	3.365401961719920
2007-01-01	2.376143102906570
2008-01-01	3.958949373120600
2009-01-01	2.115651105545600
2010-01-01	2.302023859585760
2011-01-01	4.027906673920380
2012-01-01	1.059913184456350
2013-01-01	1.134422664458120
2014-01-01	1.227507505974050
2015-01-01	0.292704628136101
2016-01-01	0.646240284454502
2017-01-01	1.850787674525320