Year	US Dollars, Monthly Level
1960-01-01	341913769.31558400
1961-01-01	314913148.87431200
1962-01-01	423675095.98735195
1963-01-01	564437214.46169510
1964-01-01	404231788.58925600
1965-01-01	456837729.80931395
1966-01-01	697460755.71285700
1967-01-01	986509370.62652600
1968-01-01	1440822105.16167000
1969-01-01	1814284953.42769000
1970-01-01	1966616459.49748000
1971-01-01	2393741502.83004000
1972-01-01	2514415144.16717000
1973-01-01	4193315885.82582000
1974-01-01	6845087449.29413000
1975-01-01	7283416491.84472100
1976-01-01	8754912867.02636000
1977-01-01	10784963001.67190000
1978-01-01	14951879754.83080100
1979-01-01	20276777215.30360000
1980-01-01	22251887567.59890000
1981-01-01	26047622239.74140000
1982-01-01	24253645969.25050000
1983-01-01	26198159487.12120000
1984-01-01	30692301681.01910000
1985-01-01	31021252566.97350300
1986-01-01	31969359606.78590000
1987-01-01	40906396163.62770000
1988-01-01	51885634435.72140000
1989-01-01	61550089176.59490000
1990-01-01	69866314514.03140000
1991-01-01	81650956655.59041000
1992-01-01	81859142166.27611000
1993-01-01	83870247989.96921000
1994-01-01	102452900300.01800000
1995-01-01	135372891385.36598000
1996-01-01	150366262303.31000000
1997-01-01	144950648060.02600000
1998-01-01	93373758085.66660000
1999-01-01	119671463699.62300000
2000-01-01	161084035301.70900000
2001-01-01	141433699368.85800000
2002-01-01	152199635964.39300000
2003-01-01	178828954649.82800000
2004-01-01	224490632962.74400000
2005-01-01	261693263968.43900000
2006-01-01	310257875965.80896000
2007-01-01	356886241334.66400000
2008-01-01	436021129828.21700000
2009-01-01	323217525630.33997000
2010-01-01	425310442786.28400000
2011-01-01	525136198963.07900000
2012-01-01	518603749060.84406000
2013-01-01	515505045635.13904000
2014-01-01	525549670622.31300000
2015-01-01	436673090937.34700000
2016-01-01	405386994253.55500000
2017-01-01	479524932682.88500000