Year	Percent Change
1978-01-01	10.203069023338200
1979-01-01	20.587101759658400
1980-01-01	22.128971380699100
1981-01-01	20.820347543659100
1982-01-01	20.416639872663100
1983-01-01	21.794000470487500
1984-01-01	23.029734443428600
1985-01-01	16.685004036251100
1986-01-01	15.293928628780100
1987-01-01	10.902542881821100
1988-01-01	4.036820402620100
1989-01-01	7.452788317291040
1990-01-01	13.603592093132400
1991-01-01	15.359612657458600
1992-01-01	13.152542613331500
1993-01-01	4.220179303813920
1994-01-01	3.550251199860210
1995-01-01	-0.467430613427557
1996-01-01	3.084540431304770
1997-01-01	3.372096476439090
1998-01-01	4.619668315824030
1999-01-01	2.481496252635790
2000-01-01	1.903500619783090
2001-01-01	1.544147075571450
2002-01-01	2.786945314044460
2003-01-01	2.347200782548670
2004-01-01	1.447240825750710
2005-01-01	3.247617916203800
2006-01-01	2.072072220131860
2007-01-01	1.692322754051330
2008-01-01	2.331218172786580
2009-01-01	1.001151017503940
2010-01-01	0.952740161742641