Year	Percent
1960-01-01	14.3913000000000000
1961-01-01	12.3773000000000000
1962-01-01	12.2853000000000000
1963-01-01	11.2413000000000000
1964-01-01	9.8647900000000000
1965-01-01	8.8069000000000000
1966-01-01	7.4304200000000000
1967-01-01	7.3665899999999995
1968-01-01	7.7217899999999995
1969-01-01	7.9349399999999990
1970-01-01	7.4466700000000000
1971-01-01	6.6570000000000000
1972-01-01	7.4885100000000010
1973-01-01	7.8282000000000000
1974-01-01	7.3578800000000010
1975-01-01	8.2098700000000000
1976-01-01	8.7184700000000000
1977-01-01	9.6766399999999990
1978-01-01	11.8842000000000000
1979-01-01	14.7548000000000000
1980-01-01	10.3761000000000000
1981-01-01	9.9991000000000000
1982-01-01	8.6617900000000000
1983-01-01	7.7850500000000000
1984-01-01	6.2990200000000000
1985-01-01	6.5830500000000000
1986-01-01	10.3582000000000000
1987-01-01	13.1194000000000000
1988-01-01	16.9595000000000000
1989-01-01	22.4795000000000000
1990-01-01	24.1334000000000000
1991-01-01	25.0839000000000000
1992-01-01	23.1036000000000000
1993-01-01	19.6673000000000000
1994-01-01	11.9952000000000000
1995-01-01	5.5778800000000000
1996-01-01	3.8239199999999998
1997-01-01	3.8019000000000000
1998-01-01	9.2394800000000000
1999-01-01	12.4279000000000000
2000-01-01	10.9764000000000000
2001-01-01	12.5191000000000000
2002-01-01	15.7415000000000000
2003-01-01	17.1083000000000000
2004-01-01	15.4434000000000000
2005-01-01	13.8141000000000000
2006-01-01	12.2640000000000010
2007-01-01	12.2596000000000000
2008-01-01	13.8528000000000000
2009-01-01	17.1122000000000000
2010-01-01	17.3199000000000000
2011-01-01	16.7605000000000000
2012-01-01	17.2443000000000000
2013-01-01	17.5189000000000000
2014-01-01	17.9224000000000000
2015-01-01	20.0886000000000000
2016-01-01	22.5592000000000000