Year	Percent
1960-01-01	20.61460000000000
1961-01-01	20.85850000000000
1962-01-01	22.39760000000000
1963-01-01	23.55220000000000
1964-01-01	24.45580000000000
1965-01-01	26.30840000000000
1966-01-01	28.39260000000000
1967-01-01	28.42730000000000
1968-01-01	29.55780000000000
1969-01-01	33.83910000000000
1970-01-01	36.88070000000000
1971-01-01	40.91940000000000
1972-01-01	43.52940000000000
1973-01-01	43.29300000000000
1974-01-01	47.01790000000000
1975-01-01	50.36960000000000
1976-01-01	56.69200000000000
1977-01-01	62.63270000000000
1978-01-01	58.27690000000000
1979-01-01	63.38390000000000
1980-01-01	71.38900000000000
1981-01-01	78.89920000000000
1982-01-01	82.27120000000000
1983-01-01	81.01960000000000
1984-01-01	83.15790000000000
1985-01-01	84.11210000000000
1986-01-01	79.93920000000000
1987-01-01	78.49700000000000
1988-01-01	75.33700000000000
1989-01-01	73.98510000000000
1990-01-01	70.30070000000000
1991-01-01	71.13630000000000
1992-01-01	76.14960000000000
1993-01-01	81.78150000000000
1994-01-01	82.91040000000000
1995-01-01	83.77360000000000
1996-01-01	84.28850000000000
1997-01-01	82.16010000000000
1998-01-01	81.03130000000000
1999-01-01	85.93360000000000
2000-01-01	91.06090000000000
2001-01-01	90.45110000000000
2002-01-01	88.92630000000000
2003-01-01	89.02030000000000
2004-01-01	89.79799999999999
2005-01-01	91.67760000000000
2006-01-01	92.65570000000000
2007-01-01	92.45780000000000
2008-01-01	98.82590000000000
2009-01-01	101.45100000000001
2010-01-01	97.45130000000000
2011-01-01	100.27400000000000
2012-01-01	100.33900000000000
2013-01-01	95.45210000000000
2014-01-01	95.57940000000000
2015-01-01	95.18230000000000
2016-01-01	97.86830000000000