Year	Percent Change
1971-01-01	9.737087832170380
1972-01-01	12.148621428482000
1973-01-01	15.284062438095500
1974-01-01	27.029215222928800
1975-01-01	17.798284384282500
1976-01-01	15.612454351824600
1977-01-01	15.804934051620200
1978-01-01	22.065266899546700
1979-01-01	21.048886325339500
1980-01-01	20.536362342227300
1981-01-01	22.353394868579600
1982-01-01	7.525980090223570
1983-01-01	13.182253406998200
1984-01-01	5.177630701872020
1985-01-01	2.983226957349480
1986-01-01	3.447758400744690
1987-01-01	3.352907132898020
1988-01-01	5.144607251118650
1989-01-01	3.004543627536350
1990-01-01	6.795862093685090
1991-01-01	13.847602237754400
1992-01-01	9.144890713051840
1993-01-01	8.783314709898590
1994-01-01	8.971765823818640
1995-01-01	9.416560826946440
1996-01-01	6.987631767216700
1997-01-01	-1.022153847412400
1998-01-01	0.417583718744766
1999-01-01	0.893890190485739
2000-01-01	-0.646423407214643
2001-01-01	1.194003480649540
2002-01-01	0.312145861779235
2003-01-01	3.679923177534960
2004-01-01	2.036297117693610
2005-01-01	0.980624760612557
2006-01-01	0.396498393245026
2007-01-01	1.025158105919870
2008-01-01	4.486745157940680
2009-01-01	3.409411178295220
2010-01-01	0.867404601233278