Year	Percent
1960-01-01	5.8164300000000000
1961-01-01	6.8277199999999990
1962-01-01	7.5363399999999990
1963-01-01	7.3787500000000000
1964-01-01	7.4068300000000000
1965-01-01	7.5256100000000000
1966-01-01	7.1295600000000010
1967-01-01	7.2961500000000000
1968-01-01	6.8205800000000005
1969-01-01	6.6194300000000000
1970-01-01	6.6957600000000010
1971-01-01	7.1151200000000000
1972-01-01	7.2480600000000010
1973-01-01	5.9901400000000000
1974-01-01	5.3506300000000010
1975-01-01	6.5514600000000000
1976-01-01	8.1155200000000000
1977-01-01	10.1459000000000000
1978-01-01	11.6442000000000000
1979-01-01	10.1326000000000000
1980-01-01	11.1295000000000000
1981-01-01	11.6577000000000000
1982-01-01	12.0638000000000000
1983-01-01	11.1979000000000000
1984-01-01	12.4858000000000000
1985-01-01	14.0801000000000000
1986-01-01	10.3745000000000000
1987-01-01	6.0670300000000000
1988-01-01	4.3054600000000000
1989-01-01	2.7507400000000000
1990-01-01	1.5626900000000000
1991-01-01	1.7053599999999998
1992-01-01	2.8679799999999998
1993-01-01	3.7150300000000005
1994-01-01	4.2113000000000000
1995-01-01	4.4535500000000000
1996-01-01	4.4973600000000000
1997-01-01	3.1990300000000000
1998-01-01	1.3598200000000000
1999-01-01	0.8449629999999999
2000-01-01	0.7122180000000000
2001-01-01	6.0478900000000000
2002-01-01	9.4081700000000000
2003-01-01	6.4593400000000000
2004-01-01	4.4639100000000000
2005-01-01	3.1728900000000000
2006-01-01	2.4445700000000000
2007-01-01	2.0435400000000000
2008-01-01	1.5707400000000000
2009-01-01	1.2350500000000000
2010-01-01	0.9384860000000000
2011-01-01	0.7530530000000000
2012-01-01	0.6966140000000001
2013-01-01	0.6483000000000000
2014-01-01	0.6116900000000000
2015-01-01	0.5416540000000000
2016-01-01	0.5895610000000000