Year	Percent Change
1971-01-01	7.545336609944590
1972-01-01	7.334198047730540
1973-01-01	16.232051755684500
1974-01-01	17.657382774721400
1975-01-01	27.648898110810100
1976-01-01	15.375937744423100
1977-01-01	18.801517380134400
1978-01-01	12.386020928120300
1979-01-01	14.539222010579200
1980-01-01	22.283919353409700
1981-01-01	19.573754985976300
1982-01-01	18.621982058791200
1983-01-01	16.621549126004100
1984-01-01	10.430149406747900
1985-01-01	7.767119112248210
1986-01-01	5.406090743602830
1987-01-01	5.239702502189360
1988-01-01	5.075288644319230
1989-01-01	6.335317147978670
1990-01-01	7.632403855854580
1991-01-01	7.608607076589550
1992-01-01	6.486046733730310
1993-01-01	-0.325440564699628
1994-01-01	-0.357939575384858
1995-01-01	1.373621797453490
1996-01-01	4.236813011858550
1997-01-01	1.681421792371310
1998-01-01	0.144459807417567
1999-01-01	3.123732022319760
2000-01-01	-0.877329409922834
2001-01-01	1.809055728195910
2002-01-01	3.698657624221030
2003-01-01	3.656874758447180
2004-01-01	1.960616025860440
2005-01-01	3.183012757288810
2006-01-01	1.779007159985670
2007-01-01	2.476268214625900
2008-01-01	3.027623190914120
2009-01-01	2.974601865882920
2010-01-01	0.341630805404595