Year	constant 2015 US$
1999	9557931137.742254
2000	9892540053.307007
2001	9782250610.76375
2002	10212669637.63736
2003	9875651539.595324
2004	9095475067.96729
2005	7913063309.13155
2006	8277064221.351596
2007	8690917432.419174
2008	9464409083.904484
2009	9833521038.176754
2010	11928061019.308372
2011	12011557446.443567
2012	10209823829.477026
2013	10230243477.135988
2014	13728986746.316483
2015	13330846130.673302
2016	13957395898.814981
2017	15367092884.595266
2018	15751270206.710098
2019	16113549421.464478
2020	16661410101.79427
2021	17727740348.309105
2022	19996891112.892628
2023	20316841370.698933