Year	Percent
1960-01-01	2.4333700000000000
1961-01-01	1.6991700000000000
1962-01-01	1.5786200000000001
1963-01-01	1.9764400000000002
1964-01-01	2.2085800000000000
1965-01-01	2.6625300000000000
1966-01-01	2.7495500000000000
1967-01-01	3.2915000000000000
1968-01-01	3.9589900000000000
1969-01-01	4.0249000000000000
1970-01-01	3.7340699999999996
1971-01-01	2.9288500000000000
1972-01-01	1.6511799999999999
1973-01-01	1.3040800000000000
1974-01-01	2.1521800000000000
1975-01-01	3.9167199999999998
1976-01-01	4.4871700000000000
1977-01-01	3.8258099999999997
1978-01-01	3.7652900000000002
1979-01-01	3.9067700000000000
1980-01-01	3.9759700000000000
1981-01-01	4.4699300000000010
1982-01-01	5.0406800000000000
1983-01-01	5.0522700000000000
1984-01-01	4.7289699999999995
1985-01-01	4.1413400000000005
1986-01-01	3.4875900000000000
1987-01-01	3.2751799999999998
1988-01-01	3.1452900000000000
1989-01-01	3.0485900000000004
1990-01-01	3.8394900000000000
1991-01-01	3.8453300000000000
1992-01-01	3.5060700000000000
1993-01-01	4.1108199999999995
1994-01-01	4.3353100000000000
1995-01-01	4.5918700000000000
1996-01-01	5.3616100000000000
1997-01-01	6.0396600000000000
1998-01-01	9.5382900000000000
1999-01-01	12.5824000000000000
2000-01-01	11.1187000000000000
2001-01-01	12.6882000000000000
2002-01-01	15.7641000000000000
2003-01-01	17.2929000000000000
2004-01-01	18.3068000000000000
2005-01-01	18.7744000000000000
2006-01-01	17.2473000000000000
2007-01-01	14.3638000000000000
2008-01-01	13.2115000000000000
2009-01-01	14.2100000000000000
2010-01-01	15.2799000000000000
2011-01-01	17.4914000000000000
2012-01-01	21.0633000000000000
2013-01-01	29.0915000000000000
2014-01-01	41.4922000000000000
2015-01-01	52.7697000000000000
2016-01-01	65.7878000000000000