Year	Percent Change
1971-01-01	9.768384324594680
1972-01-01	11.868878180849200
1973-01-01	12.833841226640400
1974-01-01	17.134234480626800
1975-01-01	20.279914568868700
1976-01-01	19.113096999650000
1977-01-01	23.134368962426300
1978-01-01	19.635184497217800
1979-01-01	16.417760446537900
1980-01-01	13.011576475977700
1981-01-01	12.681941835953900
1982-01-01	11.173990068306900
1983-01-01	11.413325726106600
1984-01-01	7.319181465157740
1985-01-01	5.389823663648550
1986-01-01	6.142639584214340
1987-01-01	6.526446102530460
1988-01-01	5.447623867472350
1989-01-01	6.164159820487340
1990-01-01	9.118049867873480
1991-01-01	9.334709796516960
1992-01-01	10.187626947269300
1993-01-01	5.950527420488710
1994-01-01	1.441715746621220
1995-01-01	2.247200034377730
1996-01-01	3.151677777050210
1997-01-01	2.041388806509270
1998-01-01	1.976257878388140
1999-01-01	1.891024138207570
2000-01-01	2.809141203914700
2001-01-01	3.174534059861980
2002-01-01	3.040690681332320
2003-01-01	3.040949822522530
2004-01-01	2.551490939909390
2005-01-01	3.241940049229320
2006-01-01	3.346352319445510
2007-01-01	3.703901997548070
2008-01-01	3.350214377680720
2009-01-01	1.663281946297100
2010-01-01	-0.906437228605055