Year	US Dollars
1973	50000.00075
1974	19149999.61853
1975	6860000.13351
1976	11310000.41962
1977	8090000.15259
1978	6909999.84741
1979	4969999.79019
1980	14500000
1981	8869999.88556
1982	7650000.09537
1983	7179999.82834
1984	9319999.69482
1985	11170000.07629
1986	12210000.03815
1987	14159999.84741
1988	24790000.91553
1989	23620000.83923
1990	12770000.45776
1991	10920000.07629
1992	11069999.69482
1993	15319999.69482
1994	8689999.58038
1995	4650000.09537
1996	8609999.65668
1997	9880000.11444
1998	9210000.03815
1999	6440000.05722
2000	5840000.15259
2001	15229999.54224
2002	38569999.69482
2003	59999.99866
2004	-280000.00119
2005	2789999.96185
2006	5519999.98093
2007	3170000.07629
2008	42229999.54224
2009	2890000.1049
2010	10989999.77112
2011	14060000.41962
2012	21079999.92371
2013	28530000.68665