Year	US Dollars, Monthly Level
1992-01-01	6199672815.884420
1993-01-01	-9905745741.515388
1994-01-01	4377966905.313810
1995-01-01	18519078879.901700
1996-01-01	13042935249.567099
1997-01-01	40904013682.764100
1998-01-01	44075595698.047400
1999-01-01	28727692434.590397
2000-01-01	24974382995.271200
2001-01-01	22287718020.449200
2002-01-01	29076632625.356400
2003-01-01	22292700064.876003
2004-01-01	31160642487.176200
2005-01-01	100079165983.513000
2006-01-01	172070127368.585000
2007-01-01	259560838512.155000
2008-01-01	301579778394.481000
2009-01-01	194266350138.516000
2010-01-01	175221171172.811000
2011-01-01	142816966316.076000
2012-01-01	228731209570.326000
2013-01-01	260736521559.779020
2014-01-01	354782820073.944000
2015-01-01	612334029955.356000
2016-01-01	554364756960.971100
2017-01-01	416086661994.708000