Year	US Dollars
1974	13140000.34332
1975	14899999.61853
1976	18329999.92371
1977	15250000
1978	9970000.26703
1979	6570000.17166
1980	7420000.07629
1981	15840000.15259
1982	24500000
1983	17459999.08447
1984	18809999.46594
1985	15079999.92371
1986	20319999.69482
1987	18680000.30518
1988	13430000.30518
1989	15039999.96185
1990	17239999.77112
1991	24350000.38147
1992	19850000.38147
1993	16510000.22888
1994	23159999.84741
1995	7710000.03815
1996	5630000.11444
1997	5440000.05722
1998	7750000
1999	9779999.73297
2000	9100000.38147
2001	9449999.80927
2002	5570000.17166
2003	2690000.05722
2004	3490000.00954
2005	5630000.11444
2006	-469999.99881
2007	15020000.45776