Year	US Dollars
1960	97623696.69747
1961	-156007583.89001
1962	-236428914.52482
1963	-217496523.68104
1964	-249939639.99809
1965	75868658.49153
1966	226237504.32936
1967	311898552.68243
1968	532749282.50381
1969	532025706.89828
1970	-22071324.03384
1971	1433247.05484
1972	273174456.05216
1973	250797396.35996
1974	-225887322.52542
1975	3432396079.49483
1976	4044477996.47944
1977	3821466694.40399
1978	5080135178.97092
1979	1690652974.07831
1980	-2487039326.84848
1981	847367630.58752
1982	870883120.72108
1983	-962072554.90448
1984	3261602332.21262
1985	3053335802.36865
1986	1572712046.25049
1987	2979904372.3176
1988	3259399439.62277
1989	3076416162.35711
1990	1335464367.98157
1991	4559455160.39052
1992	8128263333.80742
1993	11577240728.2079
1994	13034593916.7946
1995	14624069260.0423
1996	12581582847.8964
1997	14641931234.066
1998	13387149124.0171
1999	13769703900.9453
2000	16677569043.1075
2001	15645094157.3833
2002	20258043051.4564
2003	23599361401.9455
2004	35275780297.54721
2005	29634590748.4741
2006	36475337693.41199
2007	54213010413.19559
2008	58446167297.5718
2009	40779458321.8454
2010	62343126979.88139
2011	59008353585.2929
2012	69375372780.8192
2013	82987706203.1263
2014	82884339351.18663
2015	78175348804.83429
2016	75049345756.29968
2017	75012035341.01199