Year	current US$
1970	1484144.43442607
1971	1187187.22654214
1972	1282286.01364378
1973	2703005.56021617
1974	4781810.90288531
1975	2922045.12002781
1976	3121870.29911691
1977	3637459.00677684
1978	3329647.88115854
1979	3301040.66562591
1980	3233349.65468843
1981	3411814.2662309
1982	5725045.86322207
1983	5574160.66311952
1984	4908733.7219367
1985	4157245.8644355
1986	3831784.64722886
1987	3223197.00560061
1988	2950778.62868063
1989	3046646.47347944
1990	2787917.31515056
1991	2149275.49020848
1992	2044640.89129699
1993	1106892.86892721
1994	1346707.25220369
1995	2165032.27265022
1996	1896948.35988744
1997	795544.469386974
1998	69868.2349382398
1999	0
2000	53363.065898943
2001	0
2002	0
2003	0
2004	67163.9466784872
2005	124584.533960552
2006	313222.304961235
2007	583033.723637732
2008	254087.924685368
2009	90809.3084283873
2010	72159.8772425245
2011	81484.6436511558
2012	79421.258330731
2013	38110.0079084854
2014	4553.68205840315
2015	2035.7628078994
2016	5017.89092020168
2017	11739.0367479098
2018	4863.789118167
2019	0
2020	0
2021	0