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	31.36740000000000
1977-01-01	36.16700000000000
1978-01-01	37.81490000000000
1979-01-01	41.95860000000000
1980-01-01	46.75930000000000
1981-01-01	47.84410000000000
1982-01-01	48.73800000000000
1983-01-01	54.23470000000000
1984-01-01	59.64380000000000
1985-01-01	63.88500000000000
1986-01-01	61.83620000000000
1987-01-01	68.96630000000000
1988-01-01	72.34620000000000
1989-01-01	82.37899999999999
1990-01-01	75.45200000000000
1991-01-01	85.81460000000000
1992-01-01	83.32360000000000
1993-01-01	81.02580000000000
1994-01-01	75.86690000000000
1995-01-01	74.12570000000000
1996-01-01	76.82090000000000
1997-01-01	76.30420000000000
1998-01-01	75.50540000000000
1999-01-01	79.55270000000000
2000-01-01	85.55980000000000
2001-01-01	88.97920000000000
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