Year	Percent Change
1981-01-01	12.197884267457400
1982-01-01	11.555405113244800
1983-01-01	11.159360786021600
1984-01-01	7.385740048459040
1985-01-01	5.422171669396480
1986-01-01	8.372749537800860
1987-01-01	7.665449584335040
1988-01-01	5.445253952285460
1989-01-01	5.696286064006840
1990-01-01	10.290710048344000
1991-01-01	10.075503973183900
1992-01-01	10.127413643989400
1993-01-01	7.274124127599510
1994-01-01	1.364140511610520
1995-01-01	1.702694553028780
1996-01-01	4.532078937486910
1997-01-01	3.953320553590680
1998-01-01	2.622007275292130
1999-01-01	2.174574904615900
2000-01-01	4.048165203429730
2001-01-01	3.599914690616000
2002-01-01	3.062874285501890
2003-01-01	2.878755734462910
2004-01-01	2.478032075556700
2005-01-01	3.184530708743980
2006-01-01	4.008199488658490
2007-01-01	3.990373570728350
2008-01-01	3.024654078384810
2009-01-01	0.666199083673053
2010-01-01	-1.253114665457250