Year	current US$
1981	33328777311.688313
1982	29028225252.87356
1983	20485329671.55963
1984	13033449390.784225
1985	15526816211.228895
1986	11514709077.178423
1987	9894411156.08181
1988	10435930593.833569
1989	8076336007.424692
1990	9608966833.078436
1991	11604510416.141235
1992	9190608088.281385
1993	10423202207.41885
1994	16825291531.818182
1995	28175099386.363636
1996	35476481486.36364
1997	38560326736.36364
1998	38114862986.36364
1999	9615433497.250553
2000	9637935327.35909
2001	10243193746.21117
2002	11227607811.284792
2003	12632153478.953184
2004	14746181258.021023
2005	17674362416.086987
2006	21110117126.364376
2007	23377750176.515293
2008	27731521568.800648
2009	23124007766.73955
2010	24048210354.137115
2011	29721754775.31492
2012	35839657847.255905
2013	46440895419.90107
2014	55327265695.582466
2015	46484711768.25761
2016	35122321150.470505
2017	32847667356.418026
2018	40693398885.86163
2019	54675607379.70548
2020	54747780508.49592
2021	64409675734.207954
2022	64246287570.07424
2023	55742160240.506226