Year	Percent Change
1971-01-01	12.859869287981100
1972-01-01	1.775761253324610
1973-01-01	6.843946579571830
1974-01-01	19.614871598948200
1975-01-01	29.881769845713100
1976-01-01	8.579868997967280
1977-01-01	15.375066322181500
1978-01-01	9.778094927339760
1979-01-01	11.487227568121600
1980-01-01	12.046826220658100
1981-01-01	20.089649441798800
1982-01-01	16.806976306757100
1983-01-01	12.454572982285300
1984-01-01	7.023688881722600
1985-01-01	7.063473142704280
1986-01-01	5.413830106738950
1987-01-01	3.934529168844380
1988-01-01	2.435597345330450
1989-01-01	6.240189805403740
1990-01-01	7.999051237417400
1991-01-01	8.304822007285670
1992-01-01	2.672342804586090
1993-01-01	2.610987405803470
1994-01-01	-2.700425336410320
1995-01-01	1.095736549278700
1996-01-01	4.445000926694910
1997-01-01	2.109103580642900
1998-01-01	-0.616630630350681
1999-01-01	0.927519899246414
2000-01-01	-1.680375520757920
2001-01-01	2.682078563471800
2002-01-01	3.340987775192810
2003-01-01	5.680447490768510
2004-01-01	1.520948914915090
2005-01-01	1.554982889502840
2006-01-01	0.920581584939528
2007-01-01	2.206679883175280
2008-01-01	6.172286415313520
2009-01-01	4.460595787666110
2010-01-01	-0.691349413987376