Year	Dollars
1975-01-01	2638273843.30466080
1976-01-01	2731784562.47258950
1977-01-01	4432113974.92936990
1978-01-01	2144262924.99940990
1979-01-01	4672156349.22173980
1980-01-01	5246976623.58126640
1981-01-01	5995540690.26148990
1982-01-01	2334227734.70488020
1983-01-01	4005198711.27601000
1984-01-01	4922080936.77651020
1985-01-01	-3217376246.50074010
1986-01-01	-1641040529.65610980
1987-01-01	14229445410.87183800
1988-01-01	14614970018.79393000
1989-01-01	18341698266.86060000
1990-01-01	22969713152.49700200
1991-01-01	32014609683.22184000
1992-01-01	5959187241.18924050
1993-01-01	-433643108.49749798
1994-01-01	4490998052.99413970
1995-01-01	-6674572559.20260330
1996-01-01	21485563626.85608700
1997-01-01	9219704172.33856010
1998-01-01	-13074786636.44345900
1999-01-01	-10747666190.14380100
2000-01-01	15260878005.79080000
2001-01-01	18168569379.61299900
2002-01-01	17781846590.48870100
2003-01-01	4352624748.40314010
2004-01-01	36964410160.59960200
2005-01-01	73884799505.01750200
2006-01-01	107925719263.91701000
2007-01-01	138613604511.77301000
2008-01-01	149848592985.69199000