Year	current US$
1970	22890000.0732392
1971	25850000.4373491
1972	28069999.800995
1973	24410000.2702326
1974	44180000.2064556
1975	53519999.6717274
1976	40510000.3518164
1977	54299999.371171
1978	93380000.4869699
1979	146739999.838173
1980	175090000.614524
1981	133239999.877289
1982	125480001.37321699
1983	151139998.301864
1984	140339999.206364
1985	138529998.91340703
1986	161889999.914914
1987	178600000.56587198
1988	191120000.373572
1989	242820000.207052
1990	284399999.93518
1991	252759999.69244
1992	301309999.704361
1993	303570002.414286
1994	325099999.547005
1995	299430000.841618
1996	299580003.73840296
1997	178530000.654981
1998	171899998.97778
1999	159000000.119209
2000	168460001.23024002
2001	176220000.14782
2002	162089998.245239
2003	177519998.371601
2004	183380000.05483598
2005	203479998.171329
2006	232500001.728535
2007	285960001.528263
2008	300269998.61002004
2009	316530001.759529
2010	335050000.160933
2011	327390002.36988103
2012	274193288.564682
2013	306792408.88357204
2014	339220101.356506
2015	368700691.02942896
2016	385774338.111281
2017	386852010.786533
2018	390637877.46429396
2019	403763002.574444
2020	364147001.504898
2021	352799998.402596
2022	352304001.390934