Year	Percent
1968-01-01	0.022742000000000000
1969-01-01	0.022742000000000000
1970-01-01	0.022742000000000000
1971-01-01	0.022742000000000000
1972-01-01	0.062163000000000000
1973-01-01	0.062163000000000000
1974-01-01	0.016087999999999998
1975-01-01	0.008372000000000000
1976-01-01	0.011162000000000000
1977-01-01	0.046738999999999996
1978-01-01	0.008280000000000000
1979-01-01	0.004587000000000000
1980-01-01	0.024176000000000000
1981-01-01	0.112513000000000020
1982-01-01	0.142064000000000020
1983-01-01	0.251822000000000000
1984-01-01	0.374161000000000000
1985-01-01	0.169948000000000000
1986-01-01	0.102777000000000000
1987-01-01	0.454265000000000000
1988-01-01	0.023968000000000000
1989-01-01	0.079192000000000000
1990-01-01	0.105577999999999990
1991-01-01	0.030191000000000003
1992-01-01	-0.042559000000000000
1993-01-01	0.219324000000000000
1994-01-01	0.489689999999999960
1995-01-01	0.319358000000000000
1996-01-01	0.270603000000000040
1997-01-01	0.326137000000000000
1998-01-01	0.446889000000000040
1999-01-01	1.082040000000000000
2000-01-01	1.342660000000000000
2001-01-01	2.443820000000000000
2002-01-01	0.622814000000000000
2003-01-01	1.592460000000000000
2004-01-01	1.424440000000000000
2005-01-01	1.326579999999999900
2006-01-01	1.590470000000000000
2007-01-01	0.793898000000000000
2008-01-01	2.384290000000000000
2009-01-01	1.280500000000000000
2010-01-01	-0.058398000000000000
2011-01-01	0.080614000000000000
2012-01-01	-0.003136000000000000
2013-01-01	0.354989000000000000
2014-01-01	-0.181575000000000000
2015-01-01	-0.543738000000000000
2016-01-01	-0.270681000000000000