Year	US Dollars, Monthly Level
1970-01-01	18130849415.682700
1971-01-01	20920307101.596400
1972-01-01	26606070549.164700
1973-01-01	36667036957.468500
1974-01-01	46469441267.047005
1975-01-01	53016147264.013800
1976-01-01	57103389206.922900
1977-01-01	65116195638.357400
1978-01-01	79423540956.572300
1979-01-01	100671615530.480000
1980-01-01	116122396037.901000
1981-01-01	106253694212.836000
1982-01-01	96619205140.199200
1983-01-01	94840834267.082100
1984-01-01	97383354009.571610
1985-01-01	101623084189.207000
1986-01-01	124819136147.199000
1987-01-01	148290618093.826000
1988-01-01	164678307666.352000
1989-01-01	176392870893.000000
1990-01-01	212463704172.052000
1991-01-01	212633040013.406000
1992-01-01	230413135742.287020
1993-01-01	217484897987.453980
1994-01-01	248852651532.023000
1995-01-01	304082991822.311000
1996-01-01	307501028227.579960
1997-01-01	300796664054.242000
1998-01-01	318783879658.146000
1999-01-01	322843683892.305000
2000-01-01	327653771854.662000
2001-01-01	323868749760.113040
2002-01-01	332700499939.448000
2003-01-01	393129291530.834000
2004-01-01	448024577029.287000
2005-01-01	461433269248.494000
2006-01-01	497089691829.885000
2007-01-01	560443152381.125000
2008-01-01	614822082097.421000
2009-01-01	484964299173.600950
2010-01-01	520607842725.053040
2011-01-01	594977840903.592000
2012-01-01	569295832570.741000
2013-01-01	582278930024.348000
2014-01-01	582921137330.744000
2015-01-01	506185562947.735000
2016-01-01	500100063960.597050
2017-01-01	536598783540.209000