Year	current US$
1960	343952402.2137783
1961	395059152.75204444
1962	427805120.69907427
1963	465964803.30408645
1964	521915633.654754
1965	557820457.4214183
1966	611775303.2595205
1967	669509626.8291465
1968	746471554.6232129
1969	797428620.0799049
1970	833565069.1258254
1971	926435489.7622757
1972	1091547032.659241
1973	1468442681.222444
1974	1672173609.8611932
1975	2352635032.235577
1976	2579613949.6577063
1977	3304709560.7053585
1978	4334476522.790057
1979	5202572985.00382
1980	6388692149.1291485
1981	5359335293.805683
1982	4715978544.388807
1983	4341504628.347408
1984	4082098147.2336664
1985	4087806349.173724
1986	5814971646.859362
1987	6817094150.428193
1988	6937513239.92305
1989	6816882304.682612
1990	7765800476.556666
1991	7686387245.836649
1992	8183857357.939093
1993	7864155795.812271
1994	5241034846.72255
1995	7312573923.051898
2015	29902994240.144417
2016	31282187564.152596
2017	34962135547.37804
2018	39999513328.42958
2019	40167915396.394844
2020	42160085181.36225
2021	48760410414.085754
2022	47442619930.17084
2023	53318965303.420395