Year	Percent
1960-01-01	41.04630000000000
1961-01-01	40.36650000000000
1962-01-01	42.02140000000000
1963-01-01	44.27300000000000
1964-01-01	45.05290000000000
1965-01-01	46.57470000000000
1966-01-01	49.25070000000000
1967-01-01	54.68730000000000
1968-01-01	56.08540000000000
1969-01-01	54.65690000000000
1970-01-01	45.81840000000000
1971-01-01	46.25340000000000
1972-01-01	48.09750000000000
1973-01-01	48.21370000000000
1974-01-01	48.41800000000000
1975-01-01	50.75320000000000
1976-01-01	51.12840000000000
1977-01-01	52.35200000000000
1978-01-01	53.87890000000000
1979-01-01	53.50300000000000
1980-01-01	52.62720000000000
1981-01-01	52.54660000000000
1982-01-01	52.88660000000000
1983-01-01	53.52290000000000
1984-01-01	53.76690000000000
1985-01-01	54.75040000000000
1986-01-01	55.06820000000000
1987-01-01	56.63860000000000
1988-01-01	56.41500000000000
1989-01-01	55.66330000000000
1990-01-01	56.85910000000000
1991-01-01	71.96810000000000
1992-01-01	58.62680000000000
1993-01-01	62.58720000000000
1994-01-01	63.31360000000000
1995-01-01	62.97940000000000
1996-01-01	65.74440000000000
1997-01-01	67.60000000000000
1998-01-01	68.40290000000000
1999-01-01	85.62299999999999
2000-01-01	98.02140000000000
2001-01-01	63.64830000000000
2002-01-01	65.13450000000000
2003-01-01	67.98750000000000
2004-01-01	68.74670000000000
2005-01-01	70.35590000000000
2006-01-01	71.48680000000000
2007-01-01	73.37800000000000
2008-01-01	78.89590000000000
2009-01-01	84.37450000000000
2010-01-01	81.67950000000000
2011-01-01	82.41190000000000
2012-01-01	86.14160000000000
2013-01-01	88.11300000000000
2014-01-01	88.23150000000000
2015-01-01	90.42160000000000
2016-01-01	92.93920000000000