Year	US Dollars, Monthly Level
1960-01-01	-316859195.74269000
1961-01-01	-337744565.68228700
1962-01-01	-465804094.18029600
1963-01-01	-219220393.41413800
1964-01-01	-505836335.11597900
1965-01-01	-504575187.04537000
1966-01-01	-553663065.93309100
1967-01-01	-610960139.27412500
1968-01-01	-583701438.51872100
1969-01-01	-790840265.73255690
1970-01-01	-1046749689.82801000
1971-01-01	-933752589.44480900
1972-01-01	-671555459.30935700
1973-01-01	-1551589510.66381000
1974-01-01	-2232824704.56639000
1975-01-01	-1667879842.81127000
1976-01-01	-2752738106.32797000
1977-01-01	-3220946649.92872000
1978-01-01	-2829644291.53154000
1979-01-01	-3776578251.02145000
1980-01-01	-2523321116.07956000
1981-01-01	-1470355381.70919000
1982-01-01	-1533275035.27065000
1983-01-01	-221865648.43777502
1984-01-01	-599468829.22304000
1985-01-01	-1123040714.90961000
1986-01-01	-1637063215.31251000
1987-01-01	229756440.07541300
1988-01-01	1283997652.90135000
1989-01-01	1529594575.75767020
1990-01-01	3772656539.15514000
1991-01-01	3806403236.13316000
1992-01-01	6149410456.99399000
1993-01-01	6845111239.24937900
1994-01-01	6502654580.28492100
1995-01-01	5675156314.29420950
1996-01-01	6472086662.49590000
1997-01-01	4742269326.95595000
1998-01-01	2558138991.38949000
1999-01-01	5823524567.95544000
2000-01-01	6092078271.03449900
2001-01-01	6938396159.72027000
2002-01-01	7309676113.42005900
2003-01-01	9066349981.23569100
2004-01-01	8639894766.53348000
2005-01-01	9578271046.62371000
2006-01-01	6831789541.62925000
2007-01-01	4579867778.87065000
2008-01-01	6976303171.67362000
2009-01-01	11981489527.06910000
2010-01-01	13296449221.17810000
2011-01-01	16799559453.76760000
2012-01-01	14837605310.72810000
2013-01-01	13003916540.24680100
2014-01-01	11813208091.83260000
2015-01-01	9607951697.01582000
2016-01-01	10130099067.74860000
2017-01-01	9324042601.42759900