Year	Percent
1960-01-01	4.919780000000000
1961-01-01	8.053320000000000
1962-01-01	11.138700000000000
1963-01-01	9.787230000000001
1964-01-01	8.267120000000000
1965-01-01	8.994120000000000
1966-01-01	9.425410000000001
1967-01-01	12.688900000000000
1968-01-01	19.120200000000000
1969-01-01	25.232600000000000
1970-01-01	28.931200000000000
1971-01-01	31.268700000000000
1972-01-01	32.335900000000000
1973-01-01	29.804000000000002
1974-01-01	30.629400000000000
1975-01-01	30.795000000000000
1976-01-01	27.596900000000000
1977-01-01	26.850800000000000
1978-01-01	27.355500000000000
1979-01-01	30.297700000000000
1980-01-01	35.066200000000000
1981-01-01	36.913600000000000
1982-01-01	39.713100000000000
1983-01-01	40.597600000000000
1984-01-01	40.786300000000000
1985-01-01	42.363400000000000
1986-01-01	42.642600000000000
1987-01-01	41.051600000000000
1988-01-01	38.969200000000000
1989-01-01	40.892900000000000
1990-01-01	43.253000000000000
1991-01-01	44.256300000000000
1992-01-01	44.820500000000000
1993-01-01	44.388999999999996
1994-01-01	44.096500000000000
1995-01-01	43.983300000000000
1996-01-01	46.239800000000000
1997-01-01	50.120900000000000
1998-01-01	59.412000000000000
1999-01-01	60.849300000000000
2000-01-01	66.257800000000000
2001-01-01	71.878200000000000
2002-01-01	75.712400000000000
2003-01-01	81.291300000000000
2004-01-01	79.295300000000000
2005-01-01	78.722100000000000
2006-01-01	83.138200000000000
2007-01-01	87.324400000000000
2008-01-01	94.549900000000000
2009-01-01	97.395800000000000
2010-01-01	91.365500000000000
2011-01-01	91.770800000000000
2012-01-01	90.864100000000000
2013-01-01	111.779000000000000
2014-01-01	134.704000000000000
2015-01-01	136.664000000000000
2016-01-01	138.499000000000000