Year	Percent
1960-01-01	0.27631300000000003
1961-01-01	0.62750800000000000
1962-01-01	1.14905000000000000
1963-01-01	1.68730000000000000
1964-01-01	2.24142000000000000
1965-01-01	2.16157000000000000
1966-01-01	2.66249000000000000
1967-01-01	4.80772000000000000
1968-01-01	6.33212000000000000
1969-01-01	4.85498000000000000
1970-01-01	3.02680000000000000
1971-01-01	2.93369000000000040
1972-01-01	2.53043000000000000
1973-01-01	1.75921000000000000
1974-01-01	0.58305500000000000
1975-01-01	0.88301800000000010
1976-01-01	1.82754000000000020
1977-01-01	3.76828000000000030
1978-01-01	7.31491000000000000
1979-01-01	7.10582000000000000
1980-01-01	5.56688000000000000
1981-01-01	8.94759000000000000
1982-01-01	13.37980000000000000
1983-01-01	17.34460000000000000
1984-01-01	19.61750000000000000
1985-01-01	15.87870000000000000
1986-01-01	19.58580000000000000
1987-01-01	16.49460000000000000
1988-01-01	17.12840000000000000
1989-01-01	16.01340000000000000
1990-01-01	8.51464000000000000
1991-01-01	11.06660000000000000
1992-01-01	13.07560000000000000
1993-01-01	15.26340000000000000
1994-01-01	15.07930000000000000
1995-01-01	13.85090000000000000
1996-01-01	10.75410000000000000
1997-01-01	8.96032000000000000
1998-01-01	9.54133000000000000
1999-01-01	9.52358000000000000
2000-01-01	7.76709000000000000
2001-01-01	8.01068000000000000
2002-01-01	5.88723000000000100
2003-01-01	4.24170000000000000
2004-01-01	2.98057000000000000
2005-01-01	1.86897999999999990
2006-01-01	1.79450999999999980
2007-01-01	2.99063000000000000
2008-01-01	2.76794000000000030
2009-01-01	1.39134000000000000
2010-01-01	1.07028000000000000
2011-01-01	1.16963000000000000
2012-01-01	1.03214000000000000
2013-01-01	0.92794900000000000
2014-01-01	0.93864900000000000
2015-01-01	2.08957999999999980
2016-01-01	4.32763000000000000