Year	Percent Change
1971-01-01	3.199394157403600
1972-01-01	8.108036070790970
1973-01-01	10.253646891702300
1974-01-01	36.577943965576000
1975-01-01	19.395251723963800
1976-01-01	21.783196996140300
1977-01-01	21.651865302740300
1978-01-01	14.625311888258500
1979-01-01	16.492296894205300
1980-01-01	23.512569736409400
1981-01-01	23.715124487672400
1982-01-01	30.789596754823900
1983-01-01	19.632952588773900
1984-01-01	23.607327867961700
1985-01-01	14.224476956908300
1986-01-01	11.266987863784800
1987-01-01	16.545035269286600
1988-01-01	14.320767910664000
1989-01-01	20.079766201351500
1990-01-01	24.051529977612100
1991-01-01	14.247209639446600
1992-01-01	14.839595294388100
1993-01-01	22.675918757536300
1994-01-01	7.501889240094240
1995-01-01	8.115938135396610
1996-01-01	7.116696294115730
1997-01-01	9.175873831778580
1998-01-01	0.388813020256871
1999-01-01	-2.509930544108590
2000-01-01	1.946987361572260
2001-01-01	2.646893895446400
2002-01-01	18.370087591205400
2003-01-01	-0.583285599736410
2004-01-01	3.686284064328370
2005-01-01	-1.985566920075380
2006-01-01	8.653329716951780
2007-01-01	8.540133688127730
2008-01-01	8.220971507694430
2009-01-01	-3.209258699235570
2010-01-01	8.893593037640100