Year	Percent
1960-01-01	50.43120000000000
1961-01-01	52.04160000000000
1962-01-01	54.99310000000000
1963-01-01	57.61950000000000
1964-01-01	62.62260000000000
1965-01-01	64.53570000000000
1966-01-01	64.27580000000000
1967-01-01	65.40950000000000
1968-01-01	67.62350000000000
1969-01-01	67.81160000000000
1970-01-01	65.90400000000000
1971-01-01	64.43710000000000
1972-01-01	64.24340000000000
1973-01-01	67.38360000000000
1974-01-01	71.25910000000000
1975-01-01	70.79650000000000
1976-01-01	71.62250000000000
1977-01-01	70.52400000000000
1978-01-01	66.75399999999999
1979-01-01	64.57970000000000
1980-01-01	63.79900000000000
1981-01-01	64.43480000000000
1982-01-01	64.24290000000000
1983-01-01	65.90640000000000
1984-01-01	67.07200000000000
1985-01-01	68.00320000000000
1986-01-01	69.67330000000000
1987-01-01	70.50950000000000
1988-01-01	71.82590000000000
1989-01-01	71.21380000000000
1990-01-01	69.02360000000000
1991-01-01	68.03560000000000
1992-01-01	70.57690000000000
1993-01-01	72.44170000000000
1994-01-01	73.61740000000000
1995-01-01	74.18140000000000
1996-01-01	73.39790000000000
1997-01-01	75.48410000000000
1998-01-01	75.81630000000000
1999-01-01	70.45880000000000
2000-01-01	67.35400000000000
2001-01-01	71.11660000000000
2002-01-01	80.78850000000000
2003-01-01	89.80770000000000
2004-01-01	88.65360000000000
2005-01-01	83.68030000000000
2006-01-01	83.18730000000000
2007-01-01	84.92770000000000
2008-01-01	79.92390000000000
2009-01-01	76.17510000000000
2010-01-01	77.97790000000000
2011-01-01	79.38180000000000
2012-01-01	81.53850000000000
2013-01-01	77.89540000000000
2014-01-01	76.21370000000000
2015-01-01	81.10000000000000
2016-01-01	82.37910000000000