Year	Percent
1960-01-01	10.526100000000000
1961-01-01	11.511300000000000
1962-01-01	11.342000000000000
1963-01-01	10.982200000000000
1964-01-01	10.406500000000000
1965-01-01	9.458900000000000
1966-01-01	8.960139999999999
1967-01-01	9.084980000000000
1968-01-01	10.649300000000000
1969-01-01	10.974200000000000
1970-01-01	11.598900000000000
1971-01-01	11.648600000000000
1972-01-01	13.029500000000000
1973-01-01	14.182500000000000
1974-01-01	13.855100000000000
1975-01-01	14.051100000000000
1976-01-01	15.753000000000000
1977-01-01	20.104900000000000
1978-01-01	22.470500000000000
1979-01-01	23.388200000000000
1980-01-01	23.685200000000000
1981-01-01	24.608800000000000
1982-01-01	25.189400000000000
1983-01-01	24.899000000000000
1984-01-01	24.064800000000000
1985-01-01	24.353200000000000
1986-01-01	24.713000000000000
1987-01-01	53.344100000000000
1988-01-01	83.330800000000000
1989-01-01	97.702200000000000
1990-01-01	93.462700000000000
1991-01-01	88.997800000000000
1992-01-01	115.052000000000000
1993-01-01	99.609400000000000
1994-01-01	41.402600000000000
1995-01-01	32.505600000000000
1996-01-01	30.770900000000000
1997-01-01	30.553600000000000
1998-01-01	29.785000000000000
1999-01-01	31.583000000000002
2000-01-01	34.170400000000000
2001-01-01	36.702600000000000
2002-01-01	39.312900000000000
2003-01-01	44.248800000000000
2004-01-01	43.287600000000000
2005-01-01	39.551700000000000
2006-01-01	37.637500000000000
2007-01-01	35.914500000000000
2008-01-01	36.634500000000000
2009-01-01	36.205000000000000
2010-01-01	44.252700000000000
2011-01-01	45.608600000000000
2012-01-01	44.368400000000000
2013-01-01	43.028200000000000
2014-01-01	42.958600000000000
2015-01-01	45.735300000000000
2016-01-01	48.712600000000000