Year	US Dollars, Monthly Level
1960-01-01	31049538.52298160
1961-01-01	40368856.21812500
1962-01-01	54007437.04568050
1963-01-01	86708359.78068900
1964-01-01	115668218.22200100
1965-01-01	169638665.67306400
1966-01-01	248724121.34505102
1967-01-01	316498401.31929100
1968-01-01	451917667.73042900
1969-01-01	612815367.39649000
1970-01-01	827944734.25925990
1971-01-01	1057254302.37725010
1972-01-01	1606632405.66039000
1973-01-01	3184719869.75051980
1974-01-01	4462123980.26672100
1975-01-01	4885225362.76820000
1976-01-01	7665034380.41980900
1977-01-01	9963845565.88640000
1978-01-01	12672134260.83010100
1979-01-01	15011302332.74980000
1980-01-01	17501206086.61580000
1981-01-01	21263633613.81330000
1982-01-01	21797472028.77520000
1983-01-01	24264563949.82970000
1984-01-01	29155917648.55669800
1985-01-01	29986251145.88500000
1986-01-01	34667575875.65610000
1987-01-01	46915654273.27780000
1988-01-01	60589632153.42461000
1989-01-01	62391879467.44040000
1990-01-01	64939371364.10230000
1991-01-01	71765609511.16600000
1992-01-01	76845752249.81590000
1993-01-01	82379558523.36429000
1994-01-01	95840069755.69130000
1995-01-01	125290189213.80200000
1996-01-01	130109121801.52101000
1997-01-01	136365674587.05801000
1998-01-01	132912679852.39300000
1999-01-01	143733376365.31097000
2000-01-01	172443882560.44000000
2001-01-01	150615183454.76900000
2002-01-01	162191837713.49902000
2003-01-01	193423680178.35600000
2004-01-01	253494969014.73900000
2005-01-01	284554204813.27900000
2006-01-01	325482451654.53600000
2007-01-01	370937573453.93800000
2008-01-01	421919842266.93805000
2009-01-01	362408292650.67900000
2010-01-01	465326804900.41003000
2011-01-01	555613701559.82100000
2012-01-01	548408310451.61597000
2013-01-01	559501632923.97000000
2014-01-01	572335936442.98300000
2015-01-01	526729101343.37200000
2016-01-01	495082431311.93200000
2017-01-01	574063825563.87200000