Year	current US$
1970	4094005.4858504
1971	4650622.8874351
1972	5901495.52912201
1973	7851405.6448417
1974	9707894.47777023
1975	13122995.7350452
1976	13531774.7706619
1977	15102901.9148217
1978	18278412.3810119
1979	24366406.6892756
1980	30709932.9271292
1981	26696556.276176
1982	25754621.0300629
1983	22425588.4322126
1984	22545428.9373291
1985	26845245.0362257
1986	37294134.2443879
1987	47329954.6404078
1988	55880639.9113391
1989	61665038.6369354
1990	79723700.479321
1991	85623127.5065417
1992	93504286.13043
1993	77592388.1293493
1994	78538435.7689109
1995	102846594.303685
1996	106335385.023414
1997	103842900.146493
1998	106400529.776455
1999	110431975.191384
2000	127322507.016229
2001	139266862.490301
2002	159951713.152919
2003	217148413.071529
2004	268218560.72184
2005	280361919.072431
2006	307909290.659325
2007	349273344.427945
2008	362718500.438301
2009	322515598.489222
2010	322555381.699391
2011	334237787.26019
2012	288699670.604679
2013	286777449.5171
2014	294199278.270946
2015	259735326.985688
2016	273490540.584838
2017	283316500.043933
2018	304694118.392743
2019	300851016.877748
2020	298522675.704559
2021	348197436.455484