Year	US Dollars, Monthly Level
1980-01-01	74946528129.6459
1981-01-01	66942107768.4132
1982-01-01	64020093450.3227
1983-01-01	61172035528.0077
1984-01-01	62189063065.0208
1985-01-01	65320496537.4114
1986-01-01	77136649882.4807
1987-01-01	94297493126.0129
1988-01-01	106014982211.1220
1989-01-01	114708919481.7540
1990-01-01	142109352374.2520
1991-01-01	144542825001.5030
1992-01-01	150621795343.4730
1993-01-01	134719825199.0840
1994-01-01	152048583095.0370
1995-01-01	184339836643.7680
1996-01-01	193236440705.0600
1997-01-01	191723352747.8900
1998-01-01	201811318732.5250
1999-01-01	203377849113.0770
2000-01-01	218970144604.5080
2001-01-01	214432328470.5060
2002-01-01	223809362481.2580
2003-01-01	270406964475.6480
2004-01-01	325983404579.6130
2005-01-01	359364991628.7810
2006-01-01	411169915321.6220
2007-01-01	482028842362.8500
2008-01-01	539593922808.7390
2009-01-01	409356902894.1640
2010-01-01	463732037220.3920
2011-01-01	545418876150.3360
2012-01-01	513490164092.2800
2013-01-01	519066301665.5590