Year	current US$
1968	233720001.220703
1969	168039993.28613302
1970	197869995.117188
1971	236460006.71386698
1972	263820007.324219
1973	257279998.779297
1974	269750000
1975	395519989.013672
1976	355169982.910156
1977	321540008.544922
1978	415609985.35156304
1979	514950012.207031
1980	655400024.414063
1981	784820007.324219
1982	708989990.234375
1983	614409973.144531
1984	593909973.144531
1985	631919982.910156
1986	765919982.910156
1987	783419982.910156
1988	910940002.441406
1989	974059997.558594
1990	913210021.972656
1991	933700012.207031
1992	798450012.207031
1993	685570007.324219
1994	556859985.351563
1995	506739990.234375
1996	558799987.792969
1997	673179992.675781
1998	608239990.234375
1999	515760009.765625
2000	395389984.13085896
2001	286820007.324219
2002	277510009.765625
2003	301440002.441406
2004	388380004.88281304
2005	398320007.324219
2006	436040008.544922
2007	438820007.324219
2008	494910003.66210896
2009	629880004.882813
2010	601450012.207031
2011	488920013.42773396
2012	483063873.29101604
2013	465180389.404297
2014	458728027.34375
2015	420004882.8125
2016	376907775.878906
2017	346383636.47460896
2018	301416564.941406
2019	370871002.19726604
2020	398135559.082031
2021	403600738.52539104
2022	392495969.09806126