Year	Billions of United States Dollars
1960-01-01	3.23300
1961-01-01	2.97400
1962-01-01	6.10100
1963-01-01	5.62100
1964-01-01	4.82200
1965-01-01	9.24700
1966-01-01	13.63600
1967-01-01	9.86500
1968-01-01	9.05200
1969-01-01	9.17300
1970-01-01	2.00075
1971-01-01	8.25550
1972-01-01	9.10775
1973-01-01	15.87750
1974-01-01	13.98975
1975-01-01	-6.25550
1976-01-01	17.11650
1977-01-01	22.32400
1978-01-01	25.79075
1979-01-01	17.98425
1980-01-01	-6.33100
1981-01-01	29.80875
1982-01-01	-14.91350
1983-01-01	-5.75100
1984-01-01	65.40500
1985-01-01	21.82450
1986-01-01	6.57050
1987-01-01	27.14900
1988-01-01	18.48225
1989-01-01	27.69325
1990-01-01	14.54625
1991-01-01	-0.39425
1992-01-01	16.32775
1993-01-01	20.81350
1994-01-01	63.78450
1995-01-01	31.17375
1996-01-01	30.79925
1997-01-01	70.92650
1998-01-01	63.71925
1999-01-01	60.81550
2000-01-01	54.54450
2001-01-01	-38.28400
2002-01-01	19.97475
2003-01-01	14.09400
2004-01-01	64.06725
2005-01-01	57.51325
2006-01-01	68.98925
2007-01-01	33.95000
2008-01-01	-29.24125
2009-01-01	-150.77175
2010-01-01	53.91725
2011-01-01	46.26200
2012-01-01	71.21175
2013-01-01	104.53075
2014-01-01	84.48975
2015-01-01	128.72375
2016-01-01	28.94025
2017-01-01	25.48425