Year	current US$
1972	2972455.0898203594
1973	7197888.429162506
1974	44189157.47477118
1975	24560429.706062935
1976	11222265.130443709
1977	9298921.63113686
1978	13292371.508792333
1979	5701728.402789499
1980	-264163.48987297376
1981	-180415.18475319317
1982	4925633.683381971
1983	4855790.237068868
1984	10292061.82608627
1985	5100234.304889674
1986	4994739.213382051
1987	6755450.993572239
1988	11065639.092809794
1989	7414219.707938577
1990	6819368.693196322
1991	6416328.336537473
1992	6146228.687590332
2006	-68349657.7114143
2007	-72905398.16847856
2008	-81746349.95780829
2009	-76072170.32746342
2010	-80963235.63810416
2011	-99968023.53467847
2012	-99216608.80450527
2013	-92174972.46204299
2014	-107049360.75928257
2015	-83716277.63712445
2016	-96688853.96672946
2017	-105003533.2222527
2018	-102384019.27059829
2019	-116440865.42505528
2020	-96264636.96204971
2021	-127471364.16368395