Year	US Dollars, Monthly Level
1960-01-01	325166067.81376900
1961-01-01	331210739.83404500
1962-01-01	372940978.05969900
1963-01-01	412521012.02121997
1964-01-01	511586736.06881800
1965-01-01	581490680.13305600
1966-01-01	620099652.55611100
1967-01-01	682958221.77599900
1968-01-01	728831608.50381700
1969-01-01	814291586.96753100
1970-01-01	936159426.05353890
1971-01-01	1029827627.28015000
1972-01-01	1249475483.47111990
1973-01-01	1823892254.65799000
1974-01-01	2243209615.85046000
1975-01-01	2028767093.41243000
1976-01-01	1859120298.98359000
1977-01-01	2048477906.10559000
1978-01-01	2423113528.07691000
1979-01-01	3612682870.43181000
1980-01-01	4627283294.22950000
1981-01-01	4167309205.15214000
1982-01-01	4166906848.66777000
1983-01-01	4603665396.43290000
1984-01-01	5197074320.83237000
1985-01-01	5703577349.07059000
1986-01-01	7306701828.33570000
1987-01-01	9127107491.01854000
1988-01-01	10454658728.70270000
1989-01-01	12746571034.63880000
1990-01-01	16416146625.59609800
1991-01-01	16321866462.59960200
1992-01-01	17983871163.17870000
1993-01-01	14859058245.39860000
1994-01-01	18062778250.52530300
1995-01-01	23402913772.39130000
1996-01-01	25175146210.07930000
1997-01-01	24156584216.18470000
1998-01-01	24616562232.93850000
1999-01-01	24405697064.22760000
2000-01-01	24430317688.05250000
2001-01-01	24080232595.96350000
2002-01-01	25834775608.63600000
2003-01-01	31731168722.49099700
2004-01-01	35262484146.03440000
2005-01-01	38741349555.87350000
2006-01-01	45082959829.10029600
2007-01-01	52544299476.12600000
2008-01-01	57100661248.94090000
2009-01-01	44248659176.61360000
2010-01-01	49336864003.16650000
2011-01-01	59719686149.99670000
2012-01-01	58079767947.44300000
2013-01-01	63035346229.72660000
2014-01-01	64077107440.16980000
2015-01-01	55125864043.05070000
2016-01-01	55312376258.10760000
2017-01-01	62414588856.73200000