Year	Percent
1960-01-01	13.5000
1961-01-01	12.5950
1962-01-01	12.8700
1963-01-01	13.5200
1964-01-01	14.2750
1965-01-01	14.4200
1966-01-01	15.6900
1967-01-01	15.4450
1968-01-01	15.6350
1969-01-01	15.2300
1970-01-01	16.2100
1971-01-01	16.2200
1972-01-01	17.8900
1973-01-01	18.9400
1974-01-01	18.2950
1975-01-01	20.4000
1976-01-01	21.5550
1977-01-01	22.6850
1978-01-01	23.2100
1979-01-01	23.5750
1980-01-01	23.6059
1981-01-01	24.9200
1982-01-01	25.4050
1983-01-01	27.2850
1984-01-01	27.8400
1985-01-01	27.1400
1986-01-01	27.4100
1987-01-01	27.6000
1988-01-01	26.8000
1989-01-01	28.5450
1990-01-01	25.5400
1991-01-01	28.3500
1992-01-01	26.8850
1993-01-01	28.2700
1994-01-01	25.5900
1995-01-01	26.1300
1996-01-01	28.0000
1997-01-01	28.5400
1998-01-01	30.0350
1999-01-01	31.7100
2000-01-01	32.5600
2001-01-01	34.1200
2002-01-01	33.5000
2003-01-01	34.8900
2004-01-01	35.5550
2005-01-01	35.3000
2006-01-01	34.9600
2007-01-01	37.2250
2008-01-01	38.6600
2009-01-01	42.6800
2010-01-01	41.7700
2011-01-01	42.0400
2012-01-01	42.9700
2013-01-01	44.5900
2014-01-01	47.6600
2015-01-01	49.5400