Year	Percent
1960-01-01	1.5796200000000000
1961-01-01	1.6847500000000000
1962-01-01	1.9730500000000000
1963-01-01	2.7239500000000000
1964-01-01	3.3546500000000000
1965-01-01	3.2573200000000000
1966-01-01	3.8235600000000000
1967-01-01	4.3029699999999990
1968-01-01	4.6793800000000000
1969-01-01	5.1932199999999990
1970-01-01	5.6532100000000000
1971-01-01	6.3480099999999995
1972-01-01	5.9123800000000010
1973-01-01	5.4929700000000000
1974-01-01	5.8075199999999990
1975-01-01	6.5991800000000005
1976-01-01	8.6238900000000000
1977-01-01	10.8041000000000000
1978-01-01	11.1090000000000020
1979-01-01	9.4358600000000000
1980-01-01	9.3486000000000000
1981-01-01	11.4132000000000000
1982-01-01	8.9909200000000000
1983-01-01	7.4694500000000000
1984-01-01	3.3336099999999997
1985-01-01	2.0117200000000000
1986-01-01	4.5708400000000005
1987-01-01	7.3970300000000000
1988-01-01	8.9521800000000000
1989-01-01	11.0843000000000000
1990-01-01	13.9133000000000000
1991-01-01	18.7948000000000000
1992-01-01	24.4609000000000000
1993-01-01	30.4198000000000000
1994-01-01	32.9894000000000000
1995-01-01	31.9636000000000000
1996-01-01	37.2325000000000000
1997-01-01	43.4113000000000000
1998-01-01	46.0971000000000000
1999-01-01	47.6710000000000100
2000-01-01	45.9233000000000000
2001-01-01	48.6274000000000000
2002-01-01	48.2668000000000000
2003-01-01	45.6382000000000000
2004-01-01	40.5577000000000000
2005-01-01	35.9793000000000000
2006-01-01	33.3408000000000000
2007-01-01	34.8599000000000000
2008-01-01	36.3659000000000000
2009-01-01	42.6756000000000000
2010-01-01	42.5118000000000000
2011-01-01	41.2389000000000000
2012-01-01	43.7220000000000000
2013-01-01	45.9913000000000000
2014-01-01	50.0915000000000000
2015-01-01	59.6532000000000000
2016-01-01	64.8735000000000000