Year	Percent Change from Year Ago
1971-01-01	7.842764408891250000
1972-01-01	10.159237798760900000
1973-01-01	8.091400816867220000
1974-01-01	-6.438929738562110000
1975-01-01	6.368498608306540000
1976-01-01	6.850727812867140000
1977-01-01	2.943083106443670000
1978-01-01	7.244612370556940000
1979-01-01	3.283444463292310000
1980-01-01	0.678008927819406000
1981-01-01	-1.556029614757200000
1982-01-01	-1.130231570002080000
1983-01-01	-1.078258627358310000
1984-01-01	2.006681698315680000
1985-01-01	2.513202725724010000
1986-01-01	0.514746511231761000
1987-01-01	-2.256757873853000000
1988-01-01	4.287889039242230000
1989-01-01	3.798961965777290000
1990-01-01	0.000390641785391163
1991-01-01	3.101683659517970000
1992-01-01	0.697154548554524000
1993-01-01	-1.599127064755220000
1994-01-01	1.999847048026920000
1995-01-01	2.099813495782560000
1996-01-01	2.358402041863210000
1997-01-01	3.637608174839860000
1998-01-01	3.363683540123610000
1999-01-01	3.419671382930160000
2000-01-01	4.477200260379320000
2001-01-01	4.131612052411660000
2002-01-01	3.922871841392860000
2003-01-01	5.794531260534190000
2004-01-01	5.060992577761400000
2005-01-01	0.599142077849044000
2006-01-01	5.652433690623490000
2007-01-01	3.273746889678640000
2008-01-01	-0.335172587564513000
2009-01-01	-4.300733648752930000
2010-01-01	-5.479037111175210000
2011-01-01	-9.132494135290410000
2012-01-01	-7.300493949265870000
2013-01-01	-3.241425033231140000
2014-01-01	0.739777146845768000
2015-01-01	-0.290902315198631000
2016-01-01	-0.244314751645536000
2017-01-01	1.351328399011480000