Year	US Dollars, Monthly Level
1960-01-01	1219230150.6128001
1961-01-01	1674169617.7700700
1962-01-01	885441960.9498360
1963-01-01	1501272993.1694600
1964-01-01	1510526468.9382300
1965-01-01	279110368.7386840
1966-01-01	1922226497.2200400
1967-01-01	4214360489.7269096
1968-01-01	4605453623.9060300
1969-01-01	3971371758.5613900
1970-01-01	4231846474.4893500
1971-01-01	4533580766.7727000
1972-01-01	6298643493.2580800
1973-01-01	12467432508.8119000
1974-01-01	19767074283.0262000
1975-01-01	15310435761.6073000
1976-01-01	13449967316.3904000
1977-01-01	16279809195.7239990
1978-01-01	20515512053.8659020
1979-01-01	12292797708.5180000
1980-01-01	4897086556.7606000
1981-01-01	11989795620.2764000
1982-01-01	20939130044.1963000
1983-01-01	16292412931.9461000
1984-01-01	18923175740.4003000
1985-01-01	24934681526.6069030
1986-01-01	52264927250.1947000
1987-01-01	65388391075.7504040
1988-01-01	72524357031.0053000
1989-01-01	71721338061.5076000
1990-01-01	65978057275.4699900
1991-01-01	13936456753.5932000
1992-01-01	21775270463.2030000
1993-01-01	35737813152.4166000
1994-01-01	44131734122.0328100
1995-01-01	59643249787.7438000
1996-01-01	65601971677.4754000
1997-01-01	67703759709.3677000
1998-01-01	71746653328.5968000
1999-01-01	70130089449.7637000
2000-01-01	56648348189.1764000
2001-01-01	85781956996.2779000
2002-01-01	125814708138.6470000
2003-01-01	147881992302.5120000
2004-01-01	195589531577.3450000
2005-01-01	197430483308.2620200
2006-01-01	203585873992.2160000
2007-01-01	266034739049.9220000
2008-01-01	259272922228.5880000
2009-01-01	193376657553.4950000
2010-01-01	204074462298.1210000
2011-01-01	222513317129.6720000
2012-01-01	248378994174.9570000
2013-01-01	265382611767.8110000
2014-01-01	288161205091.4470000
2015-01-01	276046531926.2200000
2016-01-01	279911169769.7660000
2017-01-01	282198597157.5270000