Year	Percent
1960-01-01	7.8889200000000000
1961-01-01	6.2660599999999995
1962-01-01	4.6973199999999995
1963-01-01	5.6110800000000000
1964-01-01	6.7192000000000000
1965-01-01	7.9937500000000000
1966-01-01	9.9482100000000010
1967-01-01	12.4345000000000000
1968-01-01	14.6858000000000000
1969-01-01	16.6991000000000000
1970-01-01	19.1311000000000000
1971-01-01	19.8981000000000000
1972-01-01	19.4132000000000000
1973-01-01	19.0964000000000000
1974-01-01	17.9696000000000000
1975-01-01	17.2080000000000000
1976-01-01	17.7089000000000000
1977-01-01	17.9941000000000000
1978-01-01	18.0721000000000000
1979-01-01	17.6033000000000000
1980-01-01	17.8579000000000000
1981-01-01	17.6314000000000000
1982-01-01	18.2786000000000000
1983-01-01	18.2979000000000000
1984-01-01	15.5395000000000000
1985-01-01	13.4703000000000000
1986-01-01	13.1218000000000000
1987-01-01	11.7282000000000000
1988-01-01	12.4616000000000000
1989-01-01	13.5978000000000000
1990-01-01	14.1453000000000000
1991-01-01	14.0314000000000000
1992-01-01	17.4140000000000000
1993-01-01	20.0501000000000000
1994-01-01	23.4708000000000000
1995-01-01	23.5962000000000000
1996-01-01	23.7578000000000000
1997-01-01	25.8441000000000000
1998-01-01	24.3861000000000000
1999-01-01	22.9524000000000000
2000-01-01	23.1209000000000000
2001-01-01	22.8114000000000000
2002-01-01	20.9427000000000000
2003-01-01	16.6620000000000000
2004-01-01	13.7925000000000000
2005-01-01	14.0534000000000000
2006-01-01	13.9342000000000000
2007-01-01	14.8060000000000000
2008-01-01	18.2360000000000000
2009-01-01	25.6048000000000000
2010-01-01	29.5351000000000000
2011-01-01	35.4518000000000000
2012-01-01	40.3787000000000000
2013-01-01	41.1520000000000000
2014-01-01	45.8646000000000000
2015-01-01	52.9485000000000000
2016-01-01	53.8057000000000000