Year	Percent Change
1971-01-01	17.393298370573200
1972-01-01	14.752612808792300
1973-01-01	11.478355234789800
1974-01-01	12.214495807055800
1975-01-01	14.664854297427700
1976-01-01	9.564612343503230
1977-01-01	7.989213220573040
1978-01-01	10.865127968124200
1979-01-01	4.767455482960150
1980-01-01	9.450645370755640
1981-01-01	17.509970594841100
1982-01-01	16.594873940262000
1983-01-01	14.198887254695200
1984-01-01	8.706169907748870
1985-01-01	11.618322805411400
1986-01-01	12.220157674859300
1987-01-01	11.776015448927000
1988-01-01	5.351068381307810
1989-01-01	1.080862213351920
1990-01-01	4.673161212054490
1991-01-01	3.126675342608420
1992-01-01	1.244488262668600
1993-01-01	2.212498997800330
1994-01-01	2.073104799588050
1995-01-01	5.663835853379570
1996-01-01	8.903553943886060
1997-01-01	6.917578062560930
1998-01-01	8.727540960182280
1999-01-01	5.727602711968910
2000-01-01	5.053941226132490
2001-01-01	2.742143768287470
2002-01-01	2.441979462406110
2003-01-01	-0.154604807753327
2004-01-01	3.004479423679310
2005-01-01	5.249801924210920
2006-01-01	5.296317593859490
2007-01-01	7.142558324184970
2008-01-01	7.907595974120830
2009-01-01	6.339604045986330
2010-01-01	3.542715343880850