Year	constant 2015 US$
2002	16535679814.108374
2003	16320715976.524965
2004	18457097698.700993
2005	22689310197.874775
2006	25931612626.196327
2007	30225887678.093975
2008	33435876949.727837
2009	32549652715.624577
2010	31775318555.222878
2011	30147119032.301216
2012	31714728373.891056
2013	31342428937.047943
2014	31563277824.100243
2015	26926846081.494938
2016	21973511482.044796
2017	27366619110.914734
2018	25282932349.443512
2019	20879866285.41893
2020	19346951685.06731
2021	17691149555.19484
2022	18269753380.969017
2023	17828350409.38806