Year	Percent Change
1971-01-01	6.163656742343000
1972-01-01	5.862581526346240
1973-01-01	9.357554977204410
1974-01-01	19.305433002721700
1975-01-01	17.225946412499700
1976-01-01	14.269559997508300
1977-01-01	5.507458340712240
1978-01-01	11.051450422680000
1979-01-01	11.593832400298000
1980-01-01	12.043821259833500
1981-01-01	12.216372685471800
1982-01-01	13.972334053725900
1983-01-01	10.271210653493900
1984-01-01	6.812506667615670
1985-01-01	5.594313722448240
1986-01-01	4.040725845221620
1987-01-01	4.909212348628980
1988-01-01	5.233480012058560
1989-01-01	4.255492293081730
1990-01-01	11.572889970002500
1991-01-01	5.158771706526600
1992-01-01	2.242553543558480
1993-01-01	1.219028085797770
1994-01-01	1.006678205870410
1995-01-01	2.395396902707990
1996-01-01	0.827728783601530
1997-01-01	2.126645486133600
1998-01-01	3.785398165971780
1999-01-01	3.447358140041220
2000-01-01	3.270018221533990
2001-01-01	5.524961639300950
2002-01-01	2.755691337069080
2003-01-01	0.224752266949648
2004-01-01	1.024962976825540
2005-01-01	2.140679830015100
2006-01-01	3.481936270920020
2007-01-01	2.668934702136880
2008-01-01	2.538935963826520
2009-01-01	-0.310732055022523
2010-01-01	2.664544242297650