Year	Percent
1970-01-01	8.55123
1971-01-01	9.48355
1972-01-01	10.91860
1973-01-01	11.18900
1974-01-01	10.61500
1975-01-01	11.67880
1976-01-01	13.91690
1977-01-01	13.56390
1978-01-01	12.98000
1979-01-01	13.76780
1980-01-01	12.93110
1981-01-01	12.43190
1982-01-01	11.21750
1983-01-01	12.12990
1984-01-01	13.00410
1985-01-01	13.69130
1986-01-01	14.33580
1987-01-01	14.70010
1988-01-01	16.88930
1989-01-01	18.02640
1990-01-01	18.42630
1991-01-01	18.00710
1992-01-01	18.82750
1993-01-01	18.83340
1994-01-01	17.89460
1995-01-01	15.58160
1996-01-01	14.88420
1997-01-01	15.36350
1998-01-01	16.33170
1999-01-01	17.28870
2000-01-01	16.54590
2001-01-01	14.53600
2002-01-01	14.63140
2003-01-01	14.88240
2004-01-01	15.33320
2005-01-01	14.98590
2006-01-01	16.04130
2007-01-01	18.34500
2008-01-01	19.82930
2009-01-01	21.50570
2010-01-01	23.43060
2011-01-01	22.77480
2012-01-01	21.96460
2013-01-01	22.64500
2014-01-01	23.20440
2015-01-01	23.79820
2016-01-01	25.79030