Year	Percent
1960-01-01	7.0898300000000000
1961-01-01	6.6689100000000000
1962-01-01	6.5666500000000000
1963-01-01	6.1857100000000000
1964-01-01	6.2500900000000000
1965-01-01	6.4303099999999995
1966-01-01	6.5519000000000000
1967-01-01	6.6055300000000000
1968-01-01	6.3205400000000000
1969-01-01	6.3252300000000000
1970-01-01	5.8116000000000000
1971-01-01	5.2238200000000000
1972-01-01	4.7038699999999990
1973-01-01	4.6176500000000000
1974-01-01	6.4090800000000000
1975-01-01	6.4159600000000000
1976-01-01	5.7963800000000000
1977-01-01	6.3344100000000000
1978-01-01	7.0555400000000000
1979-01-01	7.5527800000000000
1980-01-01	8.0267800000000000
1981-01-01	10.2523000000000000
1982-01-01	13.8078000000000000
1983-01-01	13.8492000000000000
1984-01-01	11.1988000000000000
1985-01-01	10.6932000000000000
1986-01-01	9.9789000000000000
1987-01-01	15.5212000000000000
1988-01-01	19.7568000000000000
1989-01-01	18.8937000000000000
1990-01-01	18.8040000000000020
1991-01-01	17.9443000000000000
1992-01-01	18.4949000000000000
1993-01-01	24.8598000000000000
1994-01-01	27.1669999999999980
1995-01-01	22.7027000000000000
1996-01-01	19.3741000000000000
1997-01-01	15.9805000000000000
1998-01-01	13.8777000000000000
1999-01-01	12.7968000000000000
2000-01-01	12.1223000000000000
2001-01-01	11.1746000000000000
2002-01-01	10.5531000000000000
2003-01-01	9.1401899999999990
2004-01-01	7.7950899999999990
2005-01-01	7.2183699999999990
2006-01-01	6.2855900000000000
2007-01-01	5.5426300000000000
2008-01-01	5.0718200000000000
2009-01-01	5.0813900000000000
2010-01-01	6.1793600000000000
2011-01-01	7.4934000000000000
2012-01-01	7.5582000000000000
2013-01-01	7.1757200000000000
2014-01-01	7.1054200000000000
2015-01-01	6.8497500000000000
2016-01-01	6.9419400000000000