Year	Percent Change
1971-01-01	2.957144202104960
1972-01-01	5.819597632106980
1973-01-01	11.461990738150000
1974-01-01	24.112923567787400
1975-01-01	16.816977245773000
1976-01-01	19.753622812561500
1977-01-01	21.696800689924900
1978-01-01	17.257049896475500
1979-01-01	20.395866862422400
1980-01-01	17.597025322837500
1981-01-01	23.291103614281900
1982-01-01	28.432700916079300
1983-01-01	20.486772228192100
1984-01-01	19.172768876334300
1985-01-01	20.923309759576100
1986-01-01	11.080547088094800
1987-01-01	13.046731003579100
1988-01-01	16.599998270219100
1989-01-01	21.876440494935000
1990-01-01	23.406818436065000
1991-01-01	10.675035672723500
1992-01-01	11.071936007282800
1993-01-01	12.781360199921200
1994-01-01	11.390317787229000
1995-01-01	13.156603323566600
1996-01-01	6.701736013386750
1997-01-01	10.023669122391700
1998-01-01	4.269448062814760
1999-01-01	4.203199451649030
2000-01-01	2.247251632738150
2001-01-01	1.162919671951530
2002-01-01	4.373649616654280
2003-01-01	3.817017387367980
2004-01-01	2.021418999972790
2005-01-01	3.498353299814490
2006-01-01	2.930677310222440
2007-01-01	3.732131925278040
2008-01-01	5.327005353517610
2009-01-01	4.206337278570950
2010-01-01	-0.182462519232099