Year	US Dollars, Monthly Level
1960-01-01	1117952062.0024700
1961-01-01	1203591237.7104402
1962-01-01	1271434927.1168299
1963-01-01	1331164778.2480500
1964-01-01	1448583902.8802202
1965-01-01	1608032506.6680000
1966-01-01	1696427408.2255300
1967-01-01	1822158745.3975701
1968-01-01	1991163883.8881102
1969-01-01	2419833586.9713697
1970-01-01	2866562932.6597900
1971-01-01	3170476739.9536700
1972-01-01	3876055043.6442804
1973-01-01	5260429919.2969890
1974-01-01	7148121078.9748910
1975-01-01	7520151716.7587200
1976-01-01	8448711531.9980800
1977-01-01	9807289077.8150790
1978-01-01	12163960854.5039000
1979-01-01	15481809828.8084980
1980-01-01	17461890639.4903000
1981-01-01	15835388897.5369000
1982-01-01	15638115344.1630000
1983-01-01	15460137931.2358000
1984-01-01	15731958559.0849000
1985-01-01	17233266666.9801980
1986-01-01	22484367134.7059000
1987-01-01	27103854838.2807000
1988-01-01	30992340954.1955030
1989-01-01	32530904099.9474000
1990-01-01	41143651367.7064000
1991-01-01	41209253752.7380000
1992-01-01	44290713727.8355000
1993-01-01	40179970056.9111000
1994-01-01	45162867327.0339000
1995-01-01	60745460376.3254900
1996-01-01	59448557673.3791960
1997-01-01	59311883037.8412000
1998-01-01	63446991338.9326000
1999-01-01	65533761506.2916950
2000-01-01	67709957983.0274000
2001-01-01	70837989298.4410100
2002-01-01	78444302655.4473000
2003-01-01	97270139246.2321000
2004-01-01	117126383619.1970000
2005-01-01	124716742360.0280000
2006-01-01	137622351112.9080200
2007-01-01	163948165361.3520200
2008-01-01	179998710507.4400000
2009-01-01	136601909660.5450000
2010-01-01	151448678149.0800000
2011-01-01	177132591665.6439800
2012-01-01	167002322580.9590000
2013-01-01	174783371410.5840000
2014-01-01	178525927902.0130000
2015-01-01	152568418992.5260000
2016-01-01	151822078264.1410000
2017-01-01	168973611079.5330000