Year	Percent
1962-01-01	20.33690000000000
1963-01-01	21.58320000000000
1964-01-01	21.80410000000000
1965-01-01	23.89480000000000
1966-01-01	26.04220000000000
1967-01-01	27.55200000000000
1968-01-01	31.99260000000000
1969-01-01	34.08490000000000
1970-01-01	31.96390000000000
1971-01-01	24.94570000000000
1972-01-01	29.83600000000000
1973-01-01	27.91820000000000
1974-01-01	17.20240000000000
1975-01-01	20.86490000000000
1976-01-01	23.62760000000000
1977-01-01	30.53520000000000
1978-01-01	36.98280000000000
1979-01-01	28.12410000000000
1980-01-01	30.12250000000000
1981-01-01	45.18070000000000
1982-01-01	64.34700000000000
1983-01-01	72.11270000000000
1984-01-01	72.85410000000000
1985-01-01	74.37390000000000
1986-01-01	91.74030000000000
1987-01-01	77.74750000000000
1988-01-01	88.07220000000000
1989-01-01	75.99180000000000
1990-01-01	75.99180000000000
1991-01-01	177.02800000000000
1992-01-01	96.50190000000000
1993-01-01	80.57180000000000
1994-01-01	83.47220000000000
1995-01-01	82.28250000000000
1996-01-01	74.88200000000000
1997-01-01	77.15920000000000
1998-01-01	90.55910000000000
1999-01-01	78.30750000000000
2000-01-01	64.19490000000000
2001-01-01	76.68200000000000
2002-01-01	77.22860000000000
2003-01-01	66.91510000000000
2004-01-01	59.63970000000000
2005-01-01	50.01210000000000
2006-01-01	46.53250000000000
2007-01-01	50.84200000000000
2008-01-01	50.31520000000000
2009-01-01	73.94380000000000
2010-01-01	73.99510000000000
2011-01-01	60.62720000000000
2012-01-01	56.39000000000000
2013-01-01	60.14530000000000
2014-01-01	68.61399999999999
2015-01-01	94.94700000000000
2016-01-01	100.07000000000000