Year	Percent
1961-01-01	11.77470
1962-01-01	10.87790
1963-01-01	10.99960
1964-01-01	9.21227
1965-01-01	9.21227
1966-01-01	9.21227
1967-01-01	9.21227
1968-01-01	16.32210
1969-01-01	16.08110
1970-01-01	10.44710
1971-01-01	10.72890
1972-01-01	11.10980
1973-01-01	11.52140
1974-01-01	12.32800
1975-01-01	12.30250
1976-01-01	12.18890
1977-01-01	12.78660
1978-01-01	13.17120
1979-01-01	15.22400
1980-01-01	18.76320
1981-01-01	18.34300
1982-01-01	17.91850
1983-01-01	18.51400
1984-01-01	17.64380
1985-01-01	15.05390
1986-01-01	14.74810
1987-01-01	13.53940
1988-01-01	11.88670
1989-01-01	12.95980
1990-01-01	13.69560
1991-01-01	14.96530
1992-01-01	16.65830
1993-01-01	19.93300
1994-01-01	19.69840
1995-01-01	18.91400
1996-01-01	17.95450
1997-01-01	15.80350
1998-01-01	11.10460
1999-01-01	9.10413
2000-01-01	9.35706
2001-01-01	11.11420
2002-01-01	12.88820
2003-01-01	13.59790
2004-01-01	13.60210
2005-01-01	14.97120
2006-01-01	15.99950
2007-01-01	17.18030
2008-01-01	16.97110
2009-01-01	17.75730
2010-01-01	18.63790
2011-01-01	18.87480
2012-01-01	18.77810
2013-01-01	17.98390
2014-01-01	18.10870
2015-01-01	18.53000
2016-01-01	17.60180