Year	Percent
1960-01-01	15.59510000000000
1961-01-01	14.13820000000000
1962-01-01	17.92680000000000
1963-01-01	19.99610000000000
1964-01-01	19.53390000000000
1965-01-01	20.37440000000000
1966-01-01	29.85620000000000
1967-01-01	27.61310000000000
1968-01-01	23.03530000000000
1969-01-01	23.03530000000000
1970-01-01	23.03530000000000
1971-01-01	23.03530000000000
1972-01-01	23.03530000000000
1973-01-01	23.03530000000000
1974-01-01	23.03530000000000
1975-01-01	35.95390000000000
1976-01-01	31.54630000000000
1977-01-01	36.32950000000000
1978-01-01	37.81490000000000
1979-01-01	41.95860000000000
1980-01-01	46.75930000000000
1981-01-01	48.17530000000000
1982-01-01	49.33900000000000
1983-01-01	54.85200000000000
1984-01-01	60.39240000000000
1985-01-01	64.76670000000000
1986-01-01	62.87360000000000
1987-01-01	70.35940000000000
1988-01-01	73.69660000000000
1989-01-01	83.69090000000000
1990-01-01	76.67800000000000
1991-01-01	87.40100000000001
1992-01-01	84.73640000000000
1993-01-01	82.45260000000000
1994-01-01	77.17780000000000
1995-01-01	74.95970000000000
1996-01-01	77.40830000000000
1997-01-01	76.70790000000000
1998-01-01	75.76090000000000
1999-01-01	79.72970000000000
2000-01-01	85.71130000000000
2001-01-01	89.05540000000000
2002-01-01	90.65540000000000
2003-01-01	96.29140000000000
2004-01-01	99.56290000000000
2005-01-01	105.91500000000000
2006-01-01	104.22500000000000
2007-01-01	102.86600000000000
2008-01-01	95.95270000000000
2009-01-01	93.70120000000000
2010-01-01	94.98800000000000
2011-01-01	95.78160000000000
2012-01-01	94.18030000000000
2013-01-01	91.76560000000000
2014-01-01	93.68240000000000
2015-01-01	95.81040000000000
2016-01-01	98.14870000000000