Year	Percent
1960-01-01	17.761400000000000
1961-01-01	17.852700000000000
1962-01-01	16.439300000000000
1963-01-01	15.949100000000000
1964-01-01	15.255999999999998
1965-01-01	15.291600000000000
1966-01-01	15.912400000000000
1967-01-01	15.443000000000000
1968-01-01	15.272900000000000
1969-01-01	14.665700000000000
1970-01-01	12.813900000000000
1971-01-01	13.291700000000000
1972-01-01	14.604100000000000
1973-01-01	15.634500000000000
1974-01-01	15.203300000000000
1975-01-01	17.273600000000000
1976-01-01	17.901600000000000
1977-01-01	18.197000000000000
1978-01-01	19.742700000000000
1979-01-01	20.086500000000000
1980-01-01	19.084300000000000
1981-01-01	21.041300000000000
1982-01-01	20.885400000000000
1983-01-01	22.523600000000000
1984-01-01	23.890500000000000
1985-01-01	23.296700000000000
1986-01-01	23.135700000000000
1987-01-01	25.865400000000000
1988-01-01	25.162800000000000
1989-01-01	26.428400000000000
1990-01-01	28.425800000000000
1991-01-01	30.672100000000000
1992-01-01	34.390000000000000
1993-01-01	37.265900000000000
1994-01-01	36.647900000000000
1995-01-01	39.897900000000000
1996-01-01	37.323500000000000
1997-01-01	43.028800000000000
1998-01-01	46.542600000000000
1999-01-01	49.058400000000000
2000-01-01	53.745100000000000
2001-01-01	55.347900000000000
2002-01-01	59.084600000000000
2003-01-01	59.424000000000000
2004-01-01	61.167000000000000
2005-01-01	64.877600000000000
2006-01-01	68.838100000000000
2007-01-01	74.646200000000000
2008-01-01	77.634000000000000
2009-01-01	79.850200000000000
2010-01-01	82.808400000000000
2011-01-01	85.629300000000000
2012-01-01	86.433100000000000
2013-01-01	85.096800000000000
2014-01-01	86.530300000000000
2015-01-01	86.559900000000000
2016-01-01	88.626500000000000