Year	current US$
1970	7530000.083148481
1971	11509999.992325902
1972	6420000.063255425
1973	14299999.972805373
1974	16859999.764710665
1975	29519999.977201223
1976	18420000.12472271
1977	20099999.815225612
1978	24830000.15839935
1979	26939999.451860785
1980	36719999.5405972
1981	40670000.13031061
1982	27839999.776333563
1983	46800000.22612517
1984	43579999.83057385
1985	58249999.50826172
1986	39970000.11429191
1987	49729999.81045722
1988	43060000.41216612
1989	44960000.082850486
1990	54360000.39801002
1991	50309999.704360954
1992	69019999.7276068
1993	55489999.77856874
1994	29599999.867379658
1995	51040000.27477742
1996	17919999.71307813
1997	17060000.071302053
1998	10319999.959319822
1999	9099999.962374577
2000	7999999.877065422
2001	7709999.982267622
2002	14779999.762773521
2003	12829999.975860132
2004	17130000.32678248
2005	17069999.963045124
2006	10889999.926090244
2007	12009999.996051185
2008	11999999.988824133
2009	9280000.120401382
2010	4530000.0160932625
2011	8709999.848157162
2012	8275545.84294557
2013	5424097.023904318
2014	5153739.845845851
2015	3001787.0180308833
2016	2524623.3828365807
2017	4459810.05206704
2018	3566051.8016666193
2019	9451940.022408964
2020	10701138.088479629
2021	8381129.98008728
2022	7816102.41532325