Year	Percent
1960-01-01	1.7400799999999998
1961-01-01	1.6762599999999999
1962-01-01	2.3208800000000000
1963-01-01	2.7427799999999998
1964-01-01	2.3054500000000000
1965-01-01	2.0452200000000000
1966-01-01	1.8651000000000000
1967-01-01	1.6914900000000002
1968-01-01	2.4752300000000000
1969-01-01	3.4062099999999997
1970-01-01	4.2707300000000000
1971-01-01	3.2344700000000000
1972-01-01	2.5427400000000002
1973-01-01	2.7141100000000000
1974-01-01	2.5249000000000000
1975-01-01	2.3539200000000000
1976-01-01	2.4247900000000002
1977-01-01	2.1468700000000003
1978-01-01	4.4432700000000000
1979-01-01	8.0696700000000000
1980-01-01	10.5170000000000010
1981-01-01	13.8672000000000000
1982-01-01	17.5626000000000000
1983-01-01	32.2698000000000000
1984-01-01	41.2908000000000000
1985-01-01	29.4429000000000000
1986-01-01	16.7608000000000000
1987-01-01	10.4367000000000000
1988-01-01	9.6799400000000000
1989-01-01	0.8168440000000000
1990-01-01	5.5867100000000000
1991-01-01	4.0503800000000005
1992-01-01	56.1944000000000000
1993-01-01	90.9130000000000000
1994-01-01	87.5403000000000000
1995-01-01	74.7131000000000000
1996-01-01	56.9421000000000000
1997-01-01	48.5196000000000000
1998-01-01	49.3302000000000000
1999-01-01	44.5649000000000000
2000-01-01	43.5813000000000000
2001-01-01	50.7791000000000000
2002-01-01	59.6505000000000000
2003-01-01	57.3268000000000000
2004-01-01	51.2121000000000000
2005-01-01	45.5274000000000000
2006-01-01	40.6404000000000000
2007-01-01	34.9627000000000000
2008-01-01	31.3845000000000000
2009-01-01	30.9358000000000000
2010-01-01	28.7680000000000000
2011-01-01	24.7403000000000000
2012-01-01	22.4390000000000000
2013-01-01	21.1762000000000000
2014-01-01	18.5449000000000000
2015-01-01	16.0481000000000000
2016-01-01	14.8287000000000000