Year	Percent
1960-01-01	8.181818181818010
1961-01-01	18.487394957983200
1962-01-01	1.418439716312080
1963-01-01	2.097902097902120
1964-01-01	1.369863013698650
1965-01-01	3.859298157805160
1966-01-01	2.873194221603300
1967-01-01	1.365267592219050
1968-01-01	0.708073577854386
1969-01-01	2.246847535747130
1970-01-01	-0.859556021006883
1971-01-01	4.953256936409840
1972-01-01	9.180374973036880
1973-01-01	12.796894532602100
1974-01-01	25.233317779107500
1975-01-01	6.693060083667450
1976-01-01	4.474614746644970
1977-01-01	9.359852916628370
1978-01-01	10.660247592918200
1979-01-01	28.161038602443600
1980-01-01	22.447330136217600
1981-01-01	12.974697469819300
1982-01-01	5.120065437131960
1983-01-01	13.433755563163000
1984-01-01	20.311462546025500
1985-01-01	25.210716435881800
1986-01-01	31.742597267299900
1987-01-01	21.810274035098300
1988-01-01	22.594257178526800
1989-01-01	26.422126723558600
1990-01-01	37.259956179920200
1991-01-01	24.225352112676200
1992-01-01	15.192743764172100
1993-01-01	18.208661417322800
1994-01-01	20.566194837635500
1995-01-01	13.425414364640700
1996-01-01	9.799683390160790
1997-01-01	6.949566085341180
1998-01-01	11.553268435583900
1999-01-01	6.752265861027250
2000-01-01	8.982159767500230
2001-01-01	7.268060285848230
2002-01-01	10.510242085661200
2003-01-01	14.236797049914300
2004-01-01	4.323264929674930
2005-01-01	6.807382031163720
2006-01-01	9.591308846352810
2007-01-01	8.128776435045310
2008-01-01	10.154544660787500
2009-01-01	2.591946734305300
2010-01-01	4.651162790698080
2011-01-01	8.253968253968270
2012-01-01	3.675918979744910
2013-01-01	2.683857387185910
2014-01-01	5.028827674567600
2015-01-01	3.129002744739230
2016-01-01	4.086822805772430
2017-01-01	3.602477413489390