Year	US Dollars, Monthly Level
1960-01-01	231022463.3830680
1961-01-01	493629633.7561620
1962-01-01	615891280.2995640
1963-01-01	685704129.6531819
1964-01-01	539829372.5839420
1965-01-01	576767613.3583920
1966-01-01	708255834.2574700
1967-01-01	688467481.6050440
1968-01-01	763670779.8854160
1969-01-01	807552037.0228269
1970-01-01	892282472.0186180
1971-01-01	1188964001.1526098
1972-01-01	1573815257.6181200
1973-01-01	2126849776.4229800
1974-01-01	3782958634.8446900
1975-01-01	4823278478.6128100
1976-01-01	5270819792.9637600
1977-01-01	5873604201.7112300
1978-01-01	4666145657.9196205
1979-01-01	4697791561.7750600
1980-01-01	8015823054.2191500
1981-01-01	9080843455.3087400
1982-01-01	8970460476.2889210
1983-01-01	9404478117.7150300
1984-01-01	10946933887.5607990
1985-01-01	11470276887.9007020
1986-01-01	11257077061.7601990
1987-01-01	14239861451.0901990
1988-01-01	14246810553.2420000
1989-01-01	15854261509.2236000
1990-01-01	22338106301.6551970
1991-01-01	21060549104.9523000
1992-01-01	22995618767.0869980
1993-01-01	29593914519.5891000
1994-01-01	22611109426.8329000
1995-01-01	35619737623.2414000
1996-01-01	43278596913.5839000
1997-01-01	48400099770.6230000
1998-01-01	45489610977.5617100
1999-01-01	40479237497.4741060
2000-01-01	54541899399.9032000
2001-01-01	40845909992.4707000
2002-01-01	51505757876.3064960
2003-01-01	68717392804.5156900
2004-01-01	97478724006.2594000
2005-01-01	117166438649.3140000
2006-01-01	140042412547.2150000
2007-01-01	170183515971.5780000
2008-01-01	199532083021.0870000
2009-01-01	140630186636.9759800
2010-01-01	185136544595.0150000
2011-01-01	241535979859.8850000
2012-01-01	238054251486.1490200
2013-01-01	251096348238.6290000
2014-01-01	242125383638.3320000
2015-01-01	206232867539.8370000
2016-01-01	198482550145.4990000
2017-01-01	233616165730.6520000