Year	Percent Change
1971-01-01	14.52327291130120
1972-01-01	11.58009572264570
1973-01-01	20.04786665154310
1974-01-01	18.47502046735450
1975-01-01	25.90553057512950
1976-01-01	20.61673670928040
1977-01-01	19.09202153267230
1978-01-01	46.42590147310100
1979-01-01	84.42588787575220
1980-01-01	58.99456424773710
1981-01-01	31.73638359710180
1982-01-01	20.63225701424620
1983-01-01	27.30089748830380
1984-01-01	41.13446808904040
1985-01-01	50.40237980190300
1986-01-01	34.46515541551660
1987-01-01	43.28800831932670
1988-01-01	74.83660780780350
1989-01-01	105.22162376851400
1990-01-01	79.28469103757720
1991-01-01	91.17634846157040
1992-01-01	56.17131403913030
1993-01-01	55.97750983089940
1994-01-01	72.79174217458220
1995-01-01	60.76301261927800
1996-01-01	87.29046615261160
1997-01-01	88.83971131503110
1998-01-01	73.06413998613080
1999-01-01	82.37062607252360
2000-01-01	29.48859005278980
2001-01-01	38.40338062086900
2002-01-01	35.61523095766840
2003-01-01	24.05378882357130
2004-01-01	3.29593696485175
2005-01-01	2.63760649636396
2006-01-01	3.22760654849539