Year	Percent Change
1971-01-01	12.471858928413300
1972-01-01	6.828816199001950
1973-01-01	10.957485760437500
1974-01-01	13.938786901626900
1975-01-01	8.491750482135820
1976-01-01	4.020602978309820
1977-01-01	7.368132540390150
1978-01-01	14.629312677655000
1979-01-01	13.403369084448400
1980-01-01	14.397427341219600
1981-01-01	11.218113034488100
1982-01-01	6.364056694117280
1983-01-01	2.673010976774550
1984-01-01	0.233095276921223
1985-01-01	0.289222364676125
1986-01-01	8.659151876112570
1987-01-01	4.026497371975080
1988-01-01	3.060500445922090
1989-01-01	3.572013109833640
1990-01-01	6.015946495939450
1991-01-01	4.038906916786740
1992-01-01	0.230366694914421
1993-01-01	1.992033772027410
1994-01-01	0.442410331462592
1995-01-01	2.876264260499670
1996-01-01	2.043314839096740
1997-01-01	5.143763799339690
1998-01-01	5.486943519330520
1999-01-01	3.147951101372720
2000-01-01	6.131980433135730
2001-01-01	7.166271672736300
2002-01-01	3.822051068995610
2003-01-01	4.519377729477990
2004-01-01	5.328741590265590
2005-01-01	10.204422813612900
2006-01-01	11.550393511062400
2007-01-01	9.357560923633970
2008-01-01	6.352949916217890
2009-01-01	1.759592322801410
2010-01-01	0.938975720975533