Year	constant 2015 US$
1995	15705617633.672266
1996	16429763411.996487
1997	17304938304.018364
1998	18146777881.24141
1999	18542474558.553905
2000	19483953940.91953
2001	20158841784.95156
2002	21177890542.03945
2003	23173803266.600777
2004	25329096408.387497
2005	27795080897.371483
2006	29895759376.630074
2007	32895145516.320698
2008	33911341715.76679
2009	29233539950.783195
2010	28327194403.612103
2011	29236864051.403507
2012	30020905773.615223
2013	31076864696.035534
2014	32001467277.821857
2015	33035421231.082405
2016	34104036367.046078
2017	35036619675.05467
2018	36060157521.29803
2019	36819706746.4492
2020	35746932046.65858
2021	38052417729.42342
2022	38678735537.15546
2023	38389400094.07694