Year	Percent
1960-01-01	14.920800000000000
1961-01-01	14.056300000000000
1962-01-01	14.611900000000000
1963-01-01	15.049400000000000
1964-01-01	16.776700000000000
1965-01-01	18.287500000000000
1966-01-01	20.828700000000000
1967-01-01	24.076999999999998
1968-01-01	24.828600000000000
1969-01-01	25.910800000000000
1970-01-01	23.498100000000000
1971-01-01	23.324900000000000
1972-01-01	24.591700000000000
1973-01-01	27.722400000000000
1974-01-01	28.725100000000000
1975-01-01	29.704900000000000
1976-01-01	31.680999999999997
1977-01-01	31.972800000000000
1978-01-01	39.308400000000000
1979-01-01	43.867200000000000
1980-01-01	43.879000000000000
1981-01-01	41.397000000000000
1982-01-01	42.265100000000000
1983-01-01	40.107500000000000
1984-01-01	37.681200000000000
1985-01-01	40.805500000000000
1986-01-01	40.762400000000000
1987-01-01	44.191800000000000
1988-01-01	46.967700000000000
1989-01-01	48.746400000000000
1990-01-01	47.261700000000000
1991-01-01	45.982900000000000
1992-01-01	46.773300000000000
1993-01-01	51.706400000000000
1994-01-01	54.192800000000000
1995-01-01	55.636700000000000
1996-01-01	58.152500000000000
1997-01-01	60.651400000000000
1998-01-01	62.590200000000000
1999-01-01	66.611700000000000
2000-01-01	68.276000000000010
2001-01-01	75.630800000000000
2002-01-01	81.624200000000000
2003-01-01	81.951000000000010
2004-01-01	78.127700000000000
2005-01-01	79.836600000000000
2006-01-01	80.865100000000000
2007-01-01	83.359600000000000
2008-01-01	90.339300000000000
2009-01-01	88.336900000000000
2010-01-01	85.125800000000000
2011-01-01	86.137600000000000
2012-01-01	75.938000000000000
2013-01-01	64.987100000000000
2014-01-01	64.635200000000000
2015-01-01	64.704900000000000
2016-01-01	64.453900000000000