Year	constant 2015 US$
1975	3097694991.073521
1976	3725482909.040833
1977	4335046458.005799
1978	4672200506.940206
1979	5135008569.832803
1980	5430438178.307631
1981	5567122222.594387
1982	5902358121.687563
1983	6231838476.740511
1984	6777616308.64461
1985	7108536188.342387
1986	7371832835.01909
1987	7892671314.343549
1988	8575133068.884392
1989	9256635383.776972
1990	9941996621.918665
1991	10015517806.444796
1992	10956976381.729664
1993	11033675269.887745
1994	11684661967.477604
1995	12661788237.861864
1996	12819880993.048483
1997	13158440542.986969
1998	13962532678.788443
1999	14660374536.05013
2000	15534911370.449982
2001	16148938147.336416
2002	16750156089.584806
2003	17189560609.861362
2004	18053567045.43994
2005	18929707347.115433
2006	19822021318.363827
2007	20832561533.86533
2008	21592285885.82637
2009	21157144675.906815
2010	21640277594.667706
2011	21730455393.31702
2012	20981323710.75107
2013	19599182734.05708
2014	19251089114.478294
2015	19909269064.12042
2016	21218020833.654385
2017	22434550995.348595
2018	23701579256.480038
2019	25013996094.072605
2020	24152615030.364887
2021	26546456011.997612
2022	27889209738.781525
2023	28577218405.253716