Year	Percent Change
1971-01-01	4.871977791615700
1972-01-01	4.161909580535230
1973-01-01	5.769255168125510
1974-01-01	10.472628804784200
1975-01-01	8.514760136293110
1976-01-01	6.372724301389240
1977-01-01	6.661666176581830
1978-01-01	8.077890739248040
1979-01-01	9.694690984392430
1980-01-01	11.091856369047700
1981-01-01	8.251822721312180
1982-01-01	6.379060837979080
1983-01-01	3.830987582779300
1984-01-01	2.768335722137430
1985-01-01	3.371923854392270
1986-01-01	3.349227930095800
1987-01-01	3.154690398174440
1988-01-01	2.814840235269020
1989-01-01	3.639320167936870
1990-01-01	4.812246610582310
1991-01-01	4.266110784806230
1992-01-01	3.025421126618280
1993-01-01	2.694347030004580
1994-01-01	1.241089193910680
1995-01-01	1.326603238327420
1996-01-01	0.725521772930461
1997-01-01	1.051404342784520
1998-01-01	2.133843751360820
1999-01-01	1.266000827099940
2000-01-01	2.370889438318360
2001-01-01	2.258857195324670
2002-01-01	1.562756921774020
2003-01-01	2.343608002452340
2004-01-01	1.676201832354560
2005-01-01	2.503244245985650
2006-01-01	3.088026281565740
2007-01-01	2.788529896820480
2008-01-01	1.588831927586400
2009-01-01	0.149628944896220
2010-01-01	0.144597037237313