Year	US Dollars, Monthly Level
1960-01-01	-84161768.019777400
1961-01-01	-101911997.888763000
1962-01-01	-123061166.450093000
1963-01-01	-68207086.958652600
1964-01-01	-208449530.238073000
1965-01-01	-217585207.272931000
1966-01-01	-229979830.957450000
1967-01-01	-155642702.702177020
1968-01-01	43557317.279547505
1969-01-01	-40834025.041330600
1970-01-01	-312738147.965070960
1971-01-01	-424519616.724153000
1972-01-01	-259044702.513084000
1973-01-01	-508154860.239188970
1974-01-01	-1324822271.895840000
1975-01-01	-2137352869.578990000
1976-01-01	-1035509897.068960100
1977-01-01	37323130.413407700
1978-01-01	723248203.626462000
1979-01-01	-143629831.699123000
1980-01-01	-1444854562.399489900
1981-01-01	-194796080.554255000
1982-01-01	-353392986.627855000
1983-01-01	-374237804.943418000
1984-01-01	1024523182.800249900
1985-01-01	424920168.727453950
1986-01-01	938204311.526677000
1987-01-01	637822072.569474000
1988-01-01	93375058.493145390
1989-01-01	-1221612753.555900000
1990-01-01	-368561860.173831050
1991-01-01	1233987117.436950200
1992-01-01	2794543914.934330000
1993-01-01	5426572845.430571000
1994-01-01	6450203487.197869000
1995-01-01	11439131874.196200000
1996-01-01	9987057793.779000000
1997-01-01	9999293816.104440000
1998-01-01	10788447835.605099000
1999-01-01	9861566037.239780000
2000-01-01	11478522817.240099000
2001-01-01	10474363576.489300000
2002-01-01	11021943553.153599000
2003-01-01	10511620709.434198000
2004-01-01	10047311281.903101000
2005-01-01	6843111037.034830000
2006-01-01	7971786312.708530000
2007-01-01	8319262471.050081000
2008-01-01	4801878365.492660000
2009-01-01	2024866827.577180000
2010-01-01	490965078.219200000
2011-01-01	-4911989151.272350000
2012-01-01	-3149332186.889910000
2013-01-01	-2936289494.078749700
2014-01-01	-2697377083.071820000
2015-01-01	-504408642.518814000
2016-01-01	-2804215196.843270000
2017-01-01	-2527992181.787160000