Year	constant 2021 international $
1997	15763036597.412945
1998	17254309844.59258
1999	19371428107.43053
2000	20863673288.37825
2001	22645817969.878067
2002	23513043312.989048
2003	24850297579.635128
2004	26145807329.606815
2005	27492413266.392902
2006	29373995898.437973
2007	31087552774.174706
2008	32697647356.839664
2009	33099581116.530857
2010	34525049669.44332
2011	35770329678.2955
2012	36000755597.09396
2013	37246096649.17168
2014	37615184846.123535
2015	38547253771.63766
2016	39985625073.20647
2017	40965040519.22472
2018	42461851709.89398
2019	42851037512.08452
2020	41301020201.484116
2021	45086289512.06653