Year	Percent Change
1971-01-01	10.795488478360900
1972-01-01	5.972701329109030
1973-01-01	27.926192434375200
1974-01-01	29.615813821283600
1975-01-01	23.683429915016800
1976-01-01	18.092035548633500
1977-01-01	13.835574761132300
1978-01-01	16.723912135934800
1979-01-01	18.416067648318900
1980-01-01	31.797374566838000
1981-01-01	16.859927353125900
1982-01-01	17.420803882139900
1983-01-01	25.880258961655000
1984-01-01	13.271643409418200
1985-01-01	6.404673635291750
1986-01-01	8.399000733206830
1987-01-01	9.686261897972760
1988-01-01	10.358001394518500
1989-01-01	9.207030437398520
1990-01-01	8.026091595262720
1991-01-01	7.881641600021010
1992-01-01	10.202343941313500
1993-01-01	2.004848829871560
1994-01-01	5.346372697639820
1995-01-01	3.982078993088330
1996-01-01	5.471751010211140
1997-01-01	2.917932171512940
1998-01-01	1.602677052488280
1999-01-01	3.586609637725600
2000-01-01	2.797970690871680
2001-01-01	2.358783664133560
2002-01-01	3.529060552738240
2003-01-01	1.987926010842380
2004-01-01	3.848804611879820
2005-01-01	5.776602956179350
2006-01-01	3.494489465269800
2007-01-01	2.495762581164060
2008-01-01	2.496542826634320
2009-01-01	0.668068469481542
2010-01-01	2.307801436297600