Year	current US$
1973	8891096.004
1974	9055745.93
1975	7961999.993
1976	8056085.665
1977	9314481.528
1978	9961320.523
1979	12419308.704
1980	14959621.848
1981	16382667.637
1982	17770431.299
1983	19522776.94
1984	20957583.438
1985	22310064.973