Year	Percent
1967-01-01	1.452927300228520
1968-01-01	3.161936972699280
1969-01-01	0.484939553317638
1970-01-01	0.514885808022404
1971-01-01	0.488580074222929
1972-01-01	3.092193808934970
1973-01-01	9.373674075677410
1974-01-01	31.088299365448400
1975-01-01	30.226046574906500
1976-01-01	7.165861513831800
1977-01-01	13.655146506642800
1978-01-01	13.270533797387800
1979-01-01	15.673329442372600
1980-01-01	7.249392993252750
1981-01-01	6.450664471811880
1982-01-01	12.565136533413500
1983-01-01	6.593002143070820
1984-01-01	5.369570388273760
1985-01-01	1.759330056516850
1986-01-01	-1.117066572806710
1987-01-01	4.133014908091160
1988-01-01	2.978643556580400
1989-01-01	1.010278248311140
1990-01-01	4.185763726499460
1991-01-01	19.637165814837400
1992-01-01	9.560411876008080
1993-01-01	12.354388763044800
1996-01-01	7.411371735266420
1997-01-01	12.015422519568600
1998-01-01	6.210067094558090
1999-01-01	-2.405932097422600
2000-01-01	3.899529802847150
2001-01-01	3.342855067494080
2002-01-01	1.992585424539930
2003-01-01	7.449700140073660
2004-01-01	12.250710289439100
2005-01-01	9.014089180923370
2006-01-01	8.882826547779200
2007-01-01	9.080722058731660
2008-01-01	15.438213870925500
2009-01-01	12.894833426593700
2010-01-01	-0.249887635207159
2011-01-01	3.080170692402600
2012-01-01	10.271018231887600
2013-01-01	5.924268679848470
2014-01-01	2.354490528203640
2015-01-01	2.528502841924220
2016-01-01	7.174343019820130
2017-01-01	8.279536722608260