Year	Percent Change
1981-01-01	16.148914871149300
1982-01-01	14.137054947282700
1983-01-01	12.192426793746100
1984-01-01	7.441695030038410
1985-01-01	5.750899938540370
1986-01-01	5.331385168298480
1987-01-01	10.592361303778000
1988-01-01	14.912007627979500
1989-01-01	6.071878189400070
1990-01-01	12.005107776613200
1991-01-01	13.540055378657500
1992-01-01	9.840647614688880
1993-01-01	11.801098219468300
1994-01-01	5.866563599820550
1995-01-01	6.828111301235790
1996-01-01	1.839400253417460
1997-01-01	5.480286131147160
1998-01-01	4.123422900988140
1999-01-01	3.338824110292110
2000-01-01	3.170523013741540
2001-01-01	2.973088587744440
2002-01-01	3.087293737542040
2003-01-01	3.829406231472410
2004-01-01	2.489903455413850
2005-01-01	2.783908265980220
2006-01-01	3.583234338352100
2007-01-01	3.308707819509010
2008-01-01	4.360520305757750
2009-01-01	0.424430732180604
2010-01-01	1.032986081543980