Year	US Dollars, Monthly Level
1960-01-01	-18670819.288285800
1961-01-01	-5777106.456194620
1962-01-01	-4698941.828154270
1963-01-01	-15314598.802532300
1964-01-01	-10779346.323292400
1965-01-01	-8241885.609287991
1966-01-01	-18813779.316211100
1967-01-01	-60109048.813241094
1968-01-01	-52894182.955126900
1969-01-01	-16198938.575111201
1970-01-01	-7931681.173440140
1971-01-01	-57821954.794585400
1972-01-01	-43448729.796470200
1973-01-01	-56173050.115331600
1974-01-01	-179117190.789292000
1975-01-01	-173652694.495743000
1976-01-01	-67748152.149370900
1977-01-01	-91888061.709927990
1978-01-01	-33684486.730765510
1979-01-01	-45622171.011285600
1980-01-01	-81528337.377956510
1981-01-01	-127266848.122090000
1982-01-01	-268380606.472093000
1983-01-01	-76746341.056347100
1984-01-01	-115437154.112003000
1985-01-01	-100448160.223914000
1986-01-01	-60945579.968954906
1987-01-01	-207983052.167144980
1988-01-01	-182366730.591368970
1989-01-01	6178704.799330110
1990-01-01	-68954725.845243700
1991-01-01	-168619139.694915980
1992-01-01	-133869046.236215010
1993-01-01	36234628.119159500
1994-01-01	149606357.262416000
1995-01-01	31871082.037733603
1996-01-01	-155061295.851629020
1997-01-01	-201501486.582073000
1998-01-01	-542395555.577158000
1999-01-01	-531162521.218662000
2000-01-01	-683244176.756498000
2001-01-01	-253125962.350901000
2002-01-01	-36121746.806001600
2003-01-01	-452364462.368683000
2004-01-01	-850602068.149489000
2005-01-01	-1955141455.333690200
2006-01-01	-2629030741.123480300
2007-01-01	-2308281884.976090400
2008-01-01	-483827599.864978970
2009-01-01	426965912.109173000
2010-01-01	649028039.464612000
2011-01-01	503289656.213645000
2012-01-01	323272866.944372000
2013-01-01	219699293.099786000
2014-01-01	-314330177.601542060
2015-01-01	-531240346.281504000
2016-01-01	-1223168409.254890000
2017-01-01	-2075188140.788769700